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You could you use a 4 Channel Wise Box, comes complete with wireless wall switch see Mr Resistor web site. Good fo many applications.

Its not a new installation from what I read, it's an existing installation. So I would term it as an add on to the existing installation/system. The installation can be safely isolated at the fcu, don't see a problem. I certainly would not be issuing a part p certificate and insurance for...

Spark123 Nicely Put :D :D :D :D

Not sure that's 100% correct, if you have PVC incoming water main and gas main, how does this earth all the pipework ??? What you have if you don't bond is a resistance of all pipework if not bonded, you then have Volts/Resistance = Amps (current will flow), should you touch both. Also if...

I assume it's a Combi or System Boiler. If the boiler and supply are already in, you can isolate and install thermostat. Not a part P requirement or corgi.

10-12M 6.0mm2 clipped direct on a 40A Mcb with 9.5kW Shower not a problem.

Albert Point taken :D Better left for the pro though in my opinion.

Not a good idea taking the solid 6243Y 1.0mm into the boiler though. Best to terminate and connect to boiler using 3184Y Flex 0.75mm. I normally take the 6243Y (stat wire) into the Fused Connection Unit, then take a 3185Y 0.75mm (5 core flex) to the boiler.

The council are involved because by law you need a licence for a HMO. Part of the council requirement is property has a full PIC and Gas Certificate.

For the last 35 years on 2-4 bed houses I have installed 2 rings, Kitchen and rooms above on one ring, rest of the house on the other. No customer has ever had any problems. On bigger installation I will install ring to kitchen and rooms above, then 2 rings covering the rest, each ring...

100% incorrect. What if the neutral or earth connection was lost through the stop button due to a break or loose connection. As already stated should be through a contactor with lock off stop button.

First Post. Having read the thread, I think to many are using calculations based on the assumed voltage, the power rating stated on the shower etc. The key thing, is the on-site installation. How long is the cable run, big factor in cable size. Is it clipped direct or...