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Thanks for all your advice. With the extra pump in place we have now had a weekend without running problems. This morning the flow temperature was 75 C as required and the return was 59 C, so within range. With hindsight possibly the 28 kw boiler would have been a better choice but estimates of...

Thanks again Tony for your reply. Of the 3 companies that quoted for the job (one national, two local), none did anything so sophisticated as a heat loss calculation. The consensus seemed to be to allow for an average of 1.5 kw per radiator + 3 Kw for hot water. That makes 28.5, so arguably...

Forgot to say that annual gas bill with the old boiler was about £1600. In the very cold winter months the cost went up to about £225 per month based on actual meter readings. I have shopped around for the best seal I could get

Thanks for the reply. The boiler is a 438. The installer is a local company which has been in business many years. They installed the whole system 19 years ago, originally with a Potterton 125,000 btu boiler. There are 17 radiators plus hot water. I don't know the heat loss from the...

I have had a Vaillant 38kw boiler installed in my largish 4 bedroom house. From the start the boiler was cutting out. A Vaillant engineer said that this was due to insufficient water flow but did not analyse the cause as he was only there to look for faults in the boiler. The pipework to/from...