The main difference is where the hot water comes from. A mixer shower blends hot and cold water that your home already supplies, while an electric shower heats cold mains water itself as it flows through the unit. This affects the flow, the running costs and what is needed to fit each one.
How Each Type of Shower Works
A mixer shower takes hot water from your existing system, such as a combi boiler or a hot water cylinder. It also takes cold water and mixes the two inside the valve to give the temperature you choose. Many mixer valves are thermostatic, which means they help keep the temperature steady if someone turns on a tap elsewhere.
An electric shower only needs a cold water supply. Inside the unit, a heating element warms the water as it passes through. Because it makes its own hot water, it can still work when your boiler is off or your hot water tank is empty.
Hot Water and Pressure Considerations
A mixer shower depends on your hot water system. If you have a cylinder, the shower can use up the stored hot water, so a long run of showers may empty it. With a combi boiler, the boiler heats the water on demand, but the flow can be limited by the boiler’s output.
Pressure matters too. A mixer shower on a low-pressure system, such as a loft tank, may feel weak unless a suitable pump is added. An electric shower runs from mains cold water, so it needs reasonable mains pressure to work well. Its flow is also limited by how quickly the element can heat the water, so it can feel gentler, especially in winter when the incoming water is colder.
Electrical Safety and Installation Needs
Installing a mixer shower is mainly plumbing work. It involves connecting the hot and cold supplies, fitting the valve and making sure everything is watertight. A plumber can advise on mixer shower installation and check whether your system suits the valve you have in mind.
An electric shower needs a dedicated electrical circuit, often with a heavy cable running back to the consumer unit. This must be installed by a qualified electrician. Bathrooms have special safety rules for electrical work because water and electricity are a dangerous mix. Never try to wire or alter an electric shower yourself, and if one is leaking near the electrics, keep clear and contact an electrician.
Which Might Suit Your Home?
A mixer shower often suits homes with good hot water pressure, such as a combi boiler or unvented cylinder. It can give a strong, comfortable flow when the system supports it. An electric shower may suit homes where hot water is limited, or as a second shower that does not draw on the boiler.
Both types have their place, and the right choice depends on your hot water system and pressure. If you would like advice on a mixer shower for your home in Swindon, Emergency Plumber Swindon is happy to help on 01793 569521.