Our electric shower has low pressure whenever it is hot

Question

When the temperature’s turned up, the water flow drops right down and the shower feels weak, but if we turn it cooler the pressure suddenly improves. This is a fresh fitting and I'm thinking it might be indicative of a fault?

Mike · Accepted Answer

That’s how they work. To make the water hotter, the flow rate is slowed down so water stays longer in the heater, thereby getting hotter.
The electric current draw remains the same but the flow rate reduces.

Nothing wrong with it probably. If you want more flow, upgrade to a 11kw shower or a mixer unit that works entirely differently

Alex · Answer

Hello, it could be a number of things. It could be that the shower head or filter are blocked. It could also be the heating element is faulty. It’s normal for the pressure to drop abit, as the temperature goes up as the water will need to slow down to heat up if that makes sense. If the shower is old it may be worth just changing the whole unit.

Edward · Answer

It could be a blockage in the system's microfilter, or a problem with the system's thermostat adjustment.

Stuart · Answer

It’s likely the power cable supplying your power shower is not sized correctly causing the power to drop when you require hot water.

Bharat · Answer

No fault. The temp dial just reduces flow to heat chamber so the water can heat up. All electric shower operate this way

Dan · Answer

If this is an electric shower and you have to give the hot water time to heat up
The same with combination boilers

Ask the experts

Richard · Answer

Has this always been a problem all electronic showers do have lower pressure when hot as its heating the water so eyimes upgrading the shower is a good option

Michael · Answer

This will be down to the kilowatt of the shower. 
If it's an 8.5 kilowatt for example it will be poor flow rate. If you have a 10mm shower cable installed, you can have a 10.5 kilowatt shower installed, that will improve you out put. Or you could have a power shower installed or a mixer shower off your boiler.

Our electric shower has low pressure whenever it is hot

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