Author: x942p

A vented hot water cylinder is fed by a cold water tank in the loft and works at low pressure. An unvented cylinder is fed straight from the mains and stores hot water under pressure. That one difference affects water pressure, safety parts and who can install the system.

How a Vented Cylinder Works

In a vented system, a cold water storage cistern sits in the loft, often higher than the cylinder. Gravity pushes water down from the cistern into the cylinder, where it is heated. The pressure at your taps depends on how high the cistern is above them.

A vented cylinder also has an open vent pipe. This runs up and over the cistern, so the system is open to the air. If the water gets too hot and expands, it has somewhere safe to go.

Vented systems are common in older UK homes. They are fairly simple, but upstairs showers can feel weak because the cistern is not far above them.

How an Unvented Cylinder Works

An unvented cylinder connects straight to the cold mains supply, so there is no loft cistern. The hot water is stored at close to mains pressure. This often means stronger showers and the ability to run more than one tap at a time.

Because the water is stored under pressure, an unvented cylinder needs safety devices. These include a temperature and pressure relief valve, an expansion vessel or space for expansion, and a tundish with a discharge pipe. These parts are there to protect the cylinder and the people in the home, and they must never be blocked, capped or altered.

An unvented cylinder also needs good mains pressure and flow. If the supply to the home is weak, the cylinder may not perform as expected, so this is usually checked before one is chosen.

Installation Rules and Competence

The rules are much stricter for unvented cylinders. They are covered by Building Regulations requirement G3, set out in Approved Document G. Installation must be carried out by an appropriately competent installer, and the work needs to be certified through a competent person scheme or building control.

Unvented cylinders are not a DIY job. Their safety parts are there for a reason, and mistakes can be dangerous. Vented systems are less complex, but changes to them should still be done by someone who understands the whole system.

Which Type Suits Your Home?

The right choice depends on your mains pressure, the space you have, how much hot water you use and how your water is heated. Some homes suit a vented system well, while others benefit from switching to unvented.

If you are thinking about a change, it helps to understand what the work involves first. Our page on replacing a hot water cylinder covers this in more detail.

If you are in Swindon and are unsure which type of cylinder you have, Emergency Plumber Swindon can talk it through with you and look at the plumbing side. Call 01793 569521.

The cost of replacing a hot water cylinder depends on the type of cylinder, its size and how much work is needed around it. There is no single price, because every home and every hot water system is set up a little differently. Knowing the main factors can help you understand a quote and ask the right questions.

The Type and Size of Cylinder You Need

The biggest factor is whether you need a vented or an unvented cylinder. A vented cylinder is fed by a cold water tank, usually in the loft. An unvented cylinder is fed straight from the mains and stores water under pressure, so it comes with extra safety parts and stricter rules.

Capacity matters too. A larger cylinder holds more hot water, which can suit a busy household, but it usually costs more and needs more space. Swapping like for like is often simpler than changing to a different type or size.

The cylinder must also suit the way your water is heated. Cylinders made for a gas boiler, a heat pump or immersion heating can differ, and the right choice depends on your whole system.

Pipework, Location and Access

Existing pipework plays a big part in cost. If the new cylinder has its connections in the same places, less pipework may need changing. If the type or size changes, pipes may need to be rerouted or upgraded.

Where the cylinder sits also matters. Many are in an airing cupboard, which can be tight on space. A vented system also has a cistern in the loft, and that may need to be checked, replaced or removed. Awkward access can add time to the job.

Taking out and disposing of the old cylinder is part of the work as well. A full cylinder is heavy, and it needs to be drained safely before it can be moved.

Regulations, Certification and Other Trades

Unvented cylinders are covered by Building Regulations requirement G3. Installation must be carried out by an appropriately competent installer. The work then needs to be certified, either through a competent person scheme or through building control. GOV.UK explains how competent person schemes let registered installers self-certify certain heating and hot water work.

Other trades may also be needed. Wiring for an immersion heater should be done by a qualified electrician. Any work on a gas boiler must be done by a Gas Safe registered engineer. Each of these can affect the overall cost and how the job is planned.

Labour and Getting an Accurate Quote

Labour depends on how long the job takes. A simple swap is usually quicker than a change of system, and extra pipework, access issues or other trades can all add time.

The best way to get a clear picture is to have someone look at your current setup. If you are weighing up options, our page on hot water cylinder replacement explains more about the work involved.

If your hot water cylinder is showing its age and you live in Swindon, Emergency Plumber Swindon is happy to talk it through and take a look at the plumbing side. Call us on 01793 569521.

A hot water cylinder may not heat water properly because of a control setting, a faulty thermostat or immersion heater, a boiler problem or simply high demand. Limescale and valve faults can also play a part. Because several causes can look the same, it helps to work through them calmly.

How Your Cylinder Is Heated

It helps to know how your system works. Many cylinders are heated by the boiler through a coil inside the cylinder. Hot water from the boiler passes through the coil and warms the stored water. Some cylinders also have an immersion heater, an electric element that can heat the water on its own or as a backup.

Cylinders can be vented, fed from a cold water tank in the loft, or unvented, fed directly from the mains at higher pressure. Any work on an unvented cylinder needs an appropriately competent professional.

Controls, Timers and the Cylinder Thermostat

Start by checking the heating controls. A programmer or timer may be set so the hot water only comes on for a short time, or the clock may be wrong after a power cut. Make sure the hot water is set to come on when you need it.

The cylinder thermostat is usually a small dial strapped to the side of the cylinder. If it is set too low, the water may only get lukewarm. If it is faulty, the boiler may not get the signal to heat the cylinder at all.

A faulty zone valve can also stop hot water from the boiler reaching the cylinder coil. This is something a professional would need to check.

Immersion Heater and Boiler Problems

If your cylinder relies on an immersion heater, a fault with the element or its thermostat can leave the water cold. These are electrical parts, so any fault with them needs a qualified electrician. Do not open the immersion heater cover yourself.

If the boiler is not firing, or the radiators are also playing up, the problem may lie with the boiler. Any work on a gas boiler must be done by a Gas Safe registered engineer.

Demand, Cylinder Size and Limescale

Sometimes the cylinder is working, but it cannot keep up. If more people now live in the home, or several baths and showers run one after another, the cylinder may simply be too small. It may run out of hot water and take a while to recover.

Limescale can also build up over time, coating the coil or immersion heater. This can make heating slower and less efficient.

As there are many possible causes, a professional diagnosis is usually the quickest way to find the real problem. You can read more about our hot water cylinder repairs and the plumbing faults that can be looked at.

If your hot water is not as hot as it should be, call Emergency Plumber Swindon on 01793 569521. We can talk it through and take a look at the plumbing side for you.

A leaking hot water cylinder can often be repaired if the leak is coming from a pipe connection or valve. If the cylinder body itself is leaking or corroded, replacement is usually the more sensible option. The answer depends on where the water is coming from and the overall condition of the cylinder.

Leaks That Are Often Repairable

Many leaks around a cylinder come from the fittings rather than the cylinder. A compression joint that has worked loose, a worn olive or a weeping fitting can often be tightened, remade or replaced. These are usually small repairs.

Valves are another common source. A drain valve or gate valve that drips may need new packing, a new washer or a full replacement. Short sections of nearby pipework can also be repaired or renewed if they are damaged.

In these cases, the cylinder itself is still sound. Once the faulty part is fixed, it can usually carry on working as before.

Leaks That Usually Mean Replacement

If the leak is coming from the body of the cylinder, a lasting repair is unlikely. Cylinders can corrode from the inside over many years, and once the metal is thin or has a pinhole, patching it is rarely reliable.

Signs that may point to a body leak include water collecting at the base with no clear source above, green or blue staining on the copper, or dampness under the insulation jacket. These signs can have other causes, though, so it is worth having the cylinder checked before deciding.

Leaks near the immersion heater boss can be harder to judge. Sometimes a seal is the problem, but corrosion around the boss can also be the cause. As there are electrics nearby, keep clear of any wet area and leave electrical parts to a qualified electrician.

Deciding Whether a Repair Is Worth It

Whether a repair makes sense depends on more than the leak itself. The age of the cylinder, its general condition, how well it heats water and whether it still suits your household all play a part. If an older cylinder has a small fitting leak, a repair may be fine for now, but it can also be a good moment to think ahead.

If replacement is the better choice, there are things to weigh up, such as the size of cylinder you need, whether it is vented or unvented, and how it connects to your heating and pipework. Our page on hot water cylinder replacement covers that side of things. For leaks that look repairable, you can find out about our help with a leaking hot water cylinder.

A Note on Unvented Cylinders

Unvented cylinders are fed from the mains and work at higher pressure. They have safety devices that should only be dealt with by someone with the right training. Any work on an unvented cylinder needs an appropriately competent professional. If water is coming from the tundish or discharge pipe, get it checked urgently and never block it.

If your cylinder is leaking and you are unsure whether it can be repaired, call Emergency Plumber Swindon on 01793 569521. We can talk it through and take a look at the plumbing side.

A hot water cylinder can leak from its pipe connections, valves, the area around the immersion heater or the cylinder body itself. Some of these leaks are small and fixable, while others need urgent attention. Finding where the water is coming from is the first step.

Common Places a Cylinder Can Leak

Pipe connections are one of the most common sources. Many cylinders are joined to the pipework with compression joints, and these can loosen or wear over time. You may see drips gathering under a fitting, or green or white staining around it.

Valves can leak too. Gate valves on the pipework and the drain valve near the bottom of the cylinder can weep from the spindle or outlet, especially if they have not been used for a long time.

The pipework around the cylinder is worth checking as well. A leak higher up can run down the pipes and drip off the cylinder, making it look as though the cylinder itself is leaking.

The immersion heater boss, where the immersion heater screws into the cylinder, can sometimes leak. Because there are electrics nearby, keep clear of this area if it is wet. Do not touch the immersion heater or its wiring, as any electrical work needs a qualified electrician.

Finally, the cylinder body can corrode over time, especially on older copper cylinders. Water around the base with no clear source above may be associated with a leak from the body.

Vented and Unvented Cylinders Are Different

A vented cylinder is fed from a cold water tank, usually in the loft, and works at low pressure. An unvented cylinder is fed directly from the mains and works at higher pressure. It has safety devices built in, including a discharge pipe that runs to a tundish, a small open funnel in the pipe.

If you see water coming from an unvented cylinder’s tundish or discharge pipe, it needs urgent assessment by an appropriately competent professional. Never block or cap the tundish or discharge pipe, as it is there for safety. Unvented systems are covered under requirement G3 of Approved Document G, the Building Regulations guidance on hot water safety.

When You Need Help Quickly

Some leaks need prompt help. Get advice quickly if water is running steadily, if it is near electrics, if it is coming from the tundish of an unvented cylinder, or if it is soaking into floors or ceilings below.

If it is safe and you know how, you may be able to isolate the cold feed to the cylinder to slow the leak. If you are unsure, do not try. Place towels or a bowl to catch drips, move belongings away and keep clear of any wet electrical fittings. You can learn more about hot water cylinder repair in Swindon and the kinds of problems that can be looked at.

If you have noticed water around your cylinder, call Emergency Plumber Swindon on 01793 569521. We can talk it through and take a look at the plumbing side.

An old radiator may need replacing if it is badly corroded, keeps leaking, or still heats poorly after the common causes have been checked. A cold or patchy radiator does not always mean it is worn out, though. Many problems can be fixed, so it helps to know the difference.

Signs That Point Towards Replacement

Corrosion is one of the clearest signs. Rust on the surface, flaking paint with brown marks, or tiny pinholes in the panel can be associated with the radiator rusting from the inside. Once the metal itself is thinning, a repair is unlikely to last.

Persistent leaks are another warning sign. A leak from the body of the radiator, rather than a valve or joint, often means the panel is failing. Water stains on the floor or damp patches on the carpet below are worth checking.

Repeated faults can also point to the end of a radiator’s life. If the same radiator keeps needing attention, replacement may be better value than more repairs.

Cold Patches Do Not Always Mean a New Radiator

It is easy to assume a cold radiator is finished, but that is often not the case. Cold patches can have several causes, and many are fixable.

Air trapped in the radiator usually shows as a cold area at the top. Bleeding the radiator can often release the air and bring back the heat. A cold area at the bottom or middle may be linked to sludge, a build-up of dirt and rust inside the system.

Balancing can also be the issue. If some radiators get very hot while others stay lukewarm, the system may need balancing so hot water is shared more evenly. Valves can cause trouble too. The Energy Saving Trust explains that thermostatic radiator valves (TRVs) sense the air temperature and adjust the flow of hot water into the radiator, so a stuck TRV or a closed lockshield valve may leave it cold.

Repair or Replace?

The decision usually comes down to the radiator’s condition. If the problem is air, sludge, balancing or a faulty valve, a repair or service may be all that is needed. If the panel is corroded, leaking from the body, or failing again and again, replacement may make more sense.

Age on its own is not always the deciding factor. Some older radiators keep working well for years, while others wear out sooner. A newer radiator may also suit the room better if the old one never kept it warm enough.

Why a Professional Check Helps

Because several problems can look alike, a professional assessment can stop you replacing a radiator that only needed a simple fix. A plumber can check the valves, look for leaks and corrosion, and advise whether repair or replacement is the better option. If a new radiator is the answer, our page on replacing an old radiator explains what the work involves.

If you have a radiator in your Swindon home that is not working as it should, call Emergency Plumber Swindon on 01793 569521. We can take a look and talk through the options with you.

Yes, you can often replace a radiator without moving the pipes, especially if the new one is a like-for-like swap. The new radiator’s connections need to line up closely with the pipes that are already there. If they do not, some small pipework changes may be needed.

Why Like-for-Like Swaps Are Usually Simpler

A like-for-like radiator is roughly the same height, width and style as the old one. When the size and connection points match, the new radiator can usually go up on new brackets and connect to the same pipes with little fuss.

It helps to measure the old radiator before choosing a new one. Note its height and width, and how far it sits from the wall. Many radiators come in standard sizes, which can make matching easier, though older radiators do not always follow the same sizes as new ones.

Pipe Centres and Connection Types

The most useful measurement is often the pipe centres. This is the distance between the centres of the two pipes coming up from the floor or out of the wall. If the new radiator’s tappings, the points where the valves connect, give a similar distance, the swap is usually straightforward.

Connection type matters too. Many radiators have bottom-opposite-end connections, with a valve at each lower corner. Others connect at the side, in the middle of the bottom edge, or with both pipes at one end. Vertical radiators and towel rails often have different layouts. If you change from one connection type to another, the pipes may need to be altered.

Valve positions are worth checking as well. The valves need to sit where the pipes rise, with enough room to fit them and reach them later.

Small Gaps Can Often Be Bridged

If the pipe centres are only slightly different, there are fittings that can help. Adjustable or extendable valve tails can make up a small gap without cutting into the pipework. This can keep the job tidy and reduce disruption.

The brackets will usually change. New radiators tend to come with their own brackets, and these need to be fixed firmly at the right height so the connections line up. The condition of the existing connections matters too. If old fittings are corroded or the pipes are damaged, it may be better to replace a short section while the radiator is off.

When the Pipes Do Need Moving

Pipework changes are more likely if you want a much bigger or smaller radiator, a different connection type, or a radiator in a new position. Switching to a tall vertical radiator is a common example. Access also plays a part, as pipes under floorboards or buried in walls can be harder to alter.

A plumber can measure up and tell you whether your chosen radiator will suit the existing pipes. You can find out more about our help with radiator replacement and what the work usually involves.

If you are planning a new radiator and want to check whether your current pipes will work, call Emergency Plumber Swindon on 01793 569521. We are happy to talk it through with you.

The cost of replacing a radiator in Swindon depends on the radiator you choose and how much work the existing pipework needs. A simple like-for-like swap is usually quicker than a job that needs new valves, moved pipes or extra radiators. Nobody can give a fair figure without seeing the job, but knowing the main factors helps you plan.

How the Radiator Itself Affects the Price

Size and heat output are a good place to start. A bigger room usually needs a radiator that gives out more heat, and larger or higher-output radiators often cost more to buy and can be heavier to hang.

The type of radiator matters too. Single panel and double panel radiators are common choices, and many have convector fins on the back to help push out more heat. Column radiators, tall vertical designs and heated towel rails can look smart, but they may cost more and sometimes need different fittings or brackets.

Pipework, Valves and Draining the System

The existing pipework has a big effect on the job. If the new radiator lines up with the old pipes, the work is often simpler. If the pipes need to be shortened, extended or moved, it takes more time and materials.

Many people choose to fit new valves at the same time. A thermostatic radiator valve (TRV) on one side and a lockshield valve on the other is a common set-up. The Energy Saving Trust explains that TRVs sense the air temperature and adjust the flow of hot water into the radiator, which lets you control each room. Old valves that are stiff or seized may also need replacing.

The heating system usually has to be drained down, at least partly, and then refilled and bled afterwards. On some systems this takes longer than others, which can add to the overall time on the job.

Access, Walls and How Many Radiators

Access can change the cost. A radiator behind heavy furniture, under a low window or in an awkward corner can take longer to remove and fit.

The wall type matters as well. Brackets need a firm fixing, and solid brick, plasterboard and stud walls each need a different approach. Heavier radiators may need stronger fixings or extra support.

The number of radiators is another factor. Replacing several at once can be more efficient than doing them one at a time, because the system may only need draining and refilling once. Labour is the final piece, and it reflects how long the whole job takes from start to finish. Our page on radiator installation and replacement in Swindon explains more about the work involved.

Boiler Work Is a Separate Job

Changing radiators is “wet” work on the water side of the heating system. If the boiler itself needs any attention, that is a separate job. Any work on a gas boiler must be done by a Gas Safe registered engineer, so it should be planned and priced on its own.

If you are thinking about new radiators and want to talk through what your home might need, call Emergency Plumber Swindon on 01793 569521. We can take a look at the plumbing side and explain your options in plain terms.

Yes, a leaking radiator can cause boiler pressure to drop if your home has a sealed heating system. Water that escapes reduces the amount in the system, so the pressure on the gauge slowly falls. It is not the only possible cause, though, so it helps to look at the wider picture.

How a sealed heating system loses pressure

Many homes, especially those with combi boilers, have a sealed system. It is filled with water and then pressurised, and the boiler shows this on a gauge. Because the system is closed, the pressure should stay fairly steady once it has settled.

If water leaks out anywhere, the pressure falls. A slow drip may only show up as a gradual drop over days or weeks. A faster leak can make the pressure fall quickly, and some boilers may stop working until the pressure is restored.

Radiator and pipework leaks to look for

Radiator valves are a common place for small leaks. Water can weep from the spindle, the nut that joins the valve to the radiator, or the joint to the pipe below. Corroded radiators can also develop pinholes, often along the bottom edge.

Pipework leaks can be harder to spot. Pipes run under floors and inside walls, so a leak may show as a damp patch, a ceiling stain or a warped floorboard. Around radiators, look for rust marks, damp carpet or crusty deposits on fittings, which can be a sign of an old drip that has dried.

Bleeding radiators also lets a small amount of water out along with the air. So it is normal for the pressure to dip a little after bleeding. If it keeps falling afterwards, there may be a leak.

Other causes on the boiler side

Not every pressure drop comes from a radiator. A faulty expansion vessel, which absorbs the extra volume of water as it heats, can make the pressure rise and fall. The pressure relief valve may then discharge water through a pipe, often to the outside. These parts are on the boiler side. The HSE explains that wet work on pipes and radiators does not need Gas Safe registration, but work on the gas boiler needs a Gas Safe registered engineer.

If your boiler needs repressurising, follow the boiler manufacturer’s instructions. Do not take covers off the boiler or adjust any of its parts yourself.

When to get the pressure drop assessed

It is worth getting help if you need to top up the pressure regularly, or if you can see water near a radiator or pipe. Finding a leak early can limit damage to floors and ceilings. A plumber can check radiators, valves and visible pipework for signs of escaping water. If you think a radiator is to blame, our page on fixing radiator leaks in Swindon explains how we can help with the plumbing side.

If your boiler pressure keeps dropping and you suspect a leak, Emergency Plumber Swindon can take a look at the radiators and pipework and talk it through with you. Call us on 01793 569521.

A leaking radiator valve can often be repaired, especially if the leak is from a loose nut or a worn spindle seal. Where the valve body is cracked, corroded or seized, replacing the valve is usually the better option. The right fix depends on exactly where the water is coming from.

TRVs and lockshield valves

Most radiators have a valve at each end. One is often a thermostatic radiator valve, or TRV. The Energy Saving Trust explains that TRVs sense the air temperature and adjust the flow of hot water into the radiator, which lets you control each room.

The valve at the other end is usually a lockshield. It is set once to balance the system and is often hidden under a plastic cap. Both types can leak, and the causes are often similar.

Where radiator valves usually leak

The spindle is the small pin or shaft that moves to open and close the valve. A seal, often called a gland, stops water escaping around it. When the gland wears, water can weep from the top of the valve, especially when the heating is on.

The valve-to-tail nut joins the valve to the short tail that screws into the radiator. If this nut is loose, or the seal on the tail has failed, water may drip from the joint. The connection to the pipework below is usually a compression joint, with a nut and a brass olive. These can weep if the pipe has moved or the olive is worn.

Older valves may also leak through the body itself if it has corroded or cracked.

Reseal, tighten or replace?

Some leaks can be stopped by carefully tightening a nut or renewing a gland seal. It is easy to overtighten, though, which can crack fittings or squash the olive. If the seal on a tail has failed, the joint may need taking apart and remaking.

When the valve body is damaged, or an old valve no longer turns, a new valve is often more reliable. Replacing a valve may mean partly draining the heating system, so the work can be done without water pouring out. Some systems are easier to isolate than others, which affects how long the job takes.

What it means for your heating system

Many homes have a sealed heating system, which holds water under pressure. Losing water from a leaking valve can lower that pressure over time. After draining and refilling, radiators may need bleeding and the system may need repressurising, following the boiler manufacturer’s instructions.

Any work on the boiler itself needs a Gas Safe registered engineer. For the valves and pipework, you can find out more about repairing a leaking radiator valve and what the checks involve. In the meantime, a towel or bowl under the valve can protect the floor.

If a radiator valve is leaking in your Swindon home, Emergency Plumber Swindon can take a look at the plumbing side and talk you through what might help. Call us on 01793 569521.