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I have just had the boiler replaced. I am told that the gas pipes need to be earthed. The engineer proposes to run an earth wire (10mm) from the mains water pipe (where it enters the house) to the gas meter. He also wants to use an earth block at the electrical distribution box and run earth...

The gas inlet working pressure in the Vaillant EcoTec plus 630 System Boiler is 16.5 mbar. The recommended pressure for this boiler is in the range 17 – 25 mbar. The gas flow rate is 3.2 cubic metres per hr for natural gas. The recommended rate in cubic metres per hr is: Nominal – 3.24...

My main question is whether I need a separate pump in addition to the pump within the condensing boiler. I am replacing a boiler. The previous boiler was the old open flue type and had two external pumps. The new boiler is a Vaillant EcoTec 630 plus system boiler. The boiler together with the...

I am replacing a very old boiler for a new one. This is for a 4 bedroomed house with two showers. It can be a system boiler or an open vent boiler. I have been recommended Vaillant Ecotec Plus 630, Glow-Worm Ultracom 30 SXI and Worcester Greenstar 30Cdi. Other brands that have been mentioned...