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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...

Thank you Dave. Is there any way I can find out if the boiler has been set up for 9.0% CO2? Any thoughts on costs to replace say 9 metres of 28mm pipe?

Any further thoughts on the above? Would really appreciate help in particular with whether changing the initial section (say 9 metres) of pipe to 28mm will increase the gas inlet pressure at the boiler. Also thoughts on the cost of replacing the pipe would be useful.

One part I forgot to answer was whether he used flue gas analysis to set up the system. If this means measuring the flue gas, then I do not think so (although I may be wrong). He measured the gas pressure at the meter and boiler and the flow of gas at both ends. Hope this helps.

Thanks very much Dave for your thoughts. I definitely get the message that the pipe should be changed (at least the first 8 to 9 metres). If I change it, will it increase the gas inlet pressure at the boiler? I appreciate you noted that the current set-up will not harm the boiler...

Thanks again Dave. The engineer did not leave any readings except for the ones I quoted and the central heating flow (78 F) and return (61 F) temperature. The pipe length from the meter to the boiler (all 22mm except very small length at the end which is 15mm) is approx 17m. There are...

Thanks again Dave. An engineer has just installed it. Unfortunately I am not that knowledgeable on the subject, so please bear with me. Noting what I wrote and your comments, does it mean that I should increase the pipe size (I presume for part of the supply from the meter to the boiler)? At...

Any thoughts on the flow rate of gas? Is this ok for this boiler, noting the readings I noted?

Thank you Dave. The recommended readings I noted were noted in the installation booklet and related to the pressure at the boiler. Therefore I presume I would need that level of pressure at the Boiler. Is my presumption correct? Even if it is slightly less, should I worry?

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...

Thank you very much Dave and Tony for your advice.

Thank you Dave. In your suggestion, would the towel rails come on when either the central heating or the water is being heated up? The engineer initially thought that I needed one new motorised valve to switch off the flow from the cylinder to the towel rails, when the central heating...

Thanks again Gas4You. I did not specify this arrangement. Essentially the engineer is leaving the new set-up the same as the old one. How can I improve it (as far as the towel rads are concerned)?

Thanks Gas4You. Good point. Under the new system, heating and hot water will be independently controlled (and will switch on and off independent of the other). I presume that is what you meant. I very much hope so, as I would not wish to increase heating bills unnecessarily! Please let...

Thanks Tony. How would one configure to improve the towel rads being heated more often?

One further point. In the previous system, one pump was for the central heating system and the other for the hot water. I could only switch on the central heating if the hot water came on at the same time. In the new system there will be a motorised valve to separate the hot water and the...

Thank you Gas4You for your advice. The extra pump could have been for the hot water taps. The water from the taps did not previously feel as though it was pumped under pressure - i.e. water gushing out as soon as the hot water taps were opened. If it was for the hot water taps...

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...

Thank you Dangermouse and Mickyg for your advice.

Thanks for the advice, Mickyg. A couple of the radiators need to be bled every three to four weeks at present. Could this indicate a leak somewhere? The pipework is accessible except in the kitchen. On the basis of the above, should I go for the sealed system? Between Valliant Ecotec...