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    Alpha pump with bypass

    To help keep the return temperature low enough to allow condensing with TRVs, it was suggested to use a modulating pump like the Grundfos Alpha. So that as the TRVs close, the pump throttles the flow to compenstate. And this maintains the temp drop across the CH system? Does the type of...
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    combi vs hot water cylinder

    Looking for options as which way to go. Need a new boiler to supply both DHW and CH. Current system is a 20yr+ semi-pump/gavity fed system with cold water tank in loft, old hot water cylinder (no imm heater) in airing cupboard and power shower. That is in a 4-bedroom semi, one bathroom with 3-4...
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    Condensing boiler efficiency with TRVs

    Looking to have a new condensing boiler installed and have been pointed in the direction of band B boilers and avoid TRVs as they stick and are just trouble. Are Band A boilers worth the extra or not? Also thought TRVs are now part of the building regs same as condensing boilers? So might be an...
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    Effficency rating of an old Potterton Netaheat 10-16 boiler?

    Hi, our house has an old Potterton Netaheat 10-16 MKII boiler. Does anyone know what it's effficency and BTU rating it is? Tried the Potterton website, but it's not listed being so old and no email address to ask. Thinking of replacing it with a 90% effficency condensing boiler, since I hear...
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