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Cheers , I'll get it serviced. At least I know what needs doing. Thanks to you all

Difficult for me to measure the temperatures accurately but , from cold, the system takes about 2 hours to reach barely adequate water temp. With all the radiators on, the boiler never switches off. ( Boiler thermostat to max)

The Boiler seems to work OK except that the water never really gets up to temperature. I've checked the W.G pressure to the main burner at 7" W.G which should give 51000btu. A check on the gas meter shows a flow of 3 minutes per Cu ft or 20 cu ft/hour. This, I think, equates to 20,000btu/hr Any...

Thanks plugwash

Can anyone tell me why my new cooker hood says it should be connected via a FCU. Whats wrong with an appropriately fused 13A plug/socket?

It's an 8 way RCD protected CU allocated as follows:- Immersion Heater - Shower - Upstairs lighting - Downstairs lighting - Garage feed - Upstairs ring - Downstairs ring - Cooker.

Thanks guys. believe it or not this is not about the money. I really don't want the hassle of replacing a perfectly good modern CU for the sake of 1 MCB.

Thanks Adam. I guess I'll have to install a small consumer unit for the kitchen ring

I'm currently installing a separate ring for my kitchen but I've run out of ways in the consumer unit. Currently, the immersion heater is fed from its own 15A MCB in the consumer unit. If I re-wire the water heater as a fused spur off the upstairs ring this will free up the MCB that I need...