Electric Shower Not Getting Hot Enough
Check the steps below first — if you're not confident, get it fixed safely today.
Post a job — we'll find you an engineer →Electric showers are connected to mains electricity and water simultaneously. Do not attempt internal repairs unless you are a qualified electrician.
An electric shower that's turned lukewarm or downright cold can be frustrating, especially on a winter morning. The good news is that this is one of the most common shower complaints, and the cause is usually straightforward to identify. Electric showers heat water on-demand as it passes through a heating element, so when performance drops, it's typically down to water pressure, the temperature settings, wattage limitations, or scale build-up on the element itself. This guide walks through the practical checks you can do yourself before deciding whether a replacement or professional repair is needed. If you're uncomfortable working near electrics or water simultaneously, or if the problem persists after these checks, a qualified electrician or Gas Safe engineer should assess the unit to rule out thermostat or element failure.
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Most likely cause & what to check
Check the temperature setting — most electric showers have a temperature dial or button. Ensure it is turned up to maximum.
Reduce the flow rate — lower flow = more heat. Electric showers heat water on-demand; the slower the water flows, the hotter it gets. If you have pressure set to maximum, try reducing it.
Check the incoming cold water pressure. Electric showers need a minimum water pressure to operate (usually 1 bar). In low-pressure areas or properties on gravity-fed systems, an electric shower may never get very hot. Check the shower's minimum pressure requirement in the manual.
If the shower was previously hotter and has got progressively cooler, the heating element or thermostat may be failing due to scale build-up. In hard water areas, heating elements scale up and lose efficiency.
Check the shower's wattage — an older 7.5kW shower in a property with good mains pressure will always be cooler than a modern 10.8kW or 12kW unit. Upgrading to a higher-wattage unit significantly improves output temperature.
If the shower cuts to cold after a few minutes, the thermal cutout may be tripping due to overheating. This can indicate blocked water flow or scale on the element.
For a failing element or thermostat, the shower unit will need to be replaced or repaired by a qualified electrician. Given the cost of repair, replacing the unit is often more economical after 5–8 years.
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Frequently asked questions
Why does my electric shower get cold after a few minutes?
This is usually the thermal cutout kicking in to protect the shower from overheating, which suggests either scale build-up restricting water flow or a fault with the heating element itself. If it happens consistently, the unit likely needs professional inspection or replacement.
Can low water pressure stop my electric shower from getting hot?
Yes — electric showers need a minimum pressure (usually around 1 bar) to function properly. If your home relies on a gravity-fed system or you're in a low-pressure area, even a functioning shower will never reach high temperatures. Upgrading to a pressure-boosting pump may help, but this is a job for a plumber.
Is it worth repairing an old electric shower, or should I replace it?
If your shower is more than 5–8 years old and the element or thermostat has failed, replacement is usually more economical than repair. A new unit with higher wattage (10.8kW or 12kW) will also deliver noticeably hotter water than older 7.5kW models.
How does water hardness affect my electric shower's temperature?
In hard water areas, limescale builds up on the heating element over time, reducing its efficiency and causing progressively cooler output. The element may eventually fail entirely, at which point the shower needs replacing or the element needs descaling by a qualified electrician.