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Regarding power shower replacement
Power showers should have isolation valves already fitted just before connections to the power shower - Sometimes they are visible above the shower on the wall, in the loft directly above the power shower or behind the shower in a cupboard. The reason there should be isolation valves is to allow replacement of your old power shower without the need to drain down the tank and hot water cylinder. Draining down the system takes time and opens up the possibility of creating air locks in the system when refilling.
We charge £49 to fit isolation valves... if it is discovered when we arrive that no isolation valves have previously been fitted.
If your original power shower was fitted by a professional then there will be isolation valves already in place.
