Electric shower question

[Fred]

I'm about to replace a poorly shower with a new one. I see in the instructions that the shower head mustn't reach below 25mm above the bath.

With the way members of the current family shower, ie with the ability of moving the shower head by hand this has led to some opposition where the shower head should have limited movement.

I am aware that the reasons cited are to stop non-clean water from entering the cold water system.

However if I fit a double check valve in the flow to the shower, won't this remove the rules regarding the shower head and height of bath? Would a potential reach into the bath then be allowed?

[Rob Sutton]

This may be easier to fit -

Rob Sutton [e-mail]

[The Medway Handyman]

complete cobblers, but enforceable.

I once had a row with Mid Kent Water over a pressure washer. They wouldn't allow a double check valve even though it was WRC approved. They suggested that, if the 4" polyprop water main were turned off for maintenance, the pressure washer could suck so hard that it would cause the pipe to collapse. In their dreams.

[Fred]

The screwfix one is a single check valve. I thought where back siphonage could occur a double check valve would be required. I suppose I could always use 2!

[Fred]

I can see where they are coming from though. Irrespective of whether a check valve is fitted, the collapse of the main may be a possibility if the pipe couldn't cope with a vacuum. In order to preventing soiled water from entering the pipe it also assumes that everything connected to the same main is also fitted with working check valves.