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Gas man only employed directly by us and he specified on his quote to "employ electrician to re-wire new components". Sorry, not got any pictures to hand. Old CH system had an immersion heater dedicated circuit in 2.5 T&E from a 15A fuse in the consumer unit which had been disconnected...

Hi, I've had a new CH boiler, DHW cylinder and related control gear installed for which my RGI employed an electrician; I have not recieved any information about the safety or certification of the electrical installation and was wondering if this was the way it should be? The boiler, cylinder...

Something to bear in mind then; if it uses a diverter valve then don't they have a mid position when both CH and DHW are calling for heat? What would it do then? Sounds logical too about HW because if modulated to lowest setting the water in the system wouldn't be anywhere near 60C I guess...

Hello Brig001, seen that but it is not actually very useful or informative site but I like the sound of the technology.

Hello, I am trying to get quotes for a new gas central heating and hot water system. I want to replace boiler and hot water cylinder with a system boiler and unvented cylinder and would like a fully modulating boiler to work with a Honeywell programmable modulating room thermostat (Opentherm...