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You might have a point there croydoncorgi. Never looked at it like that, thought they were just for use as external pumps.

Ok, well could see why 2 variable pumps might fight each other and cause problems, bit like a TRV and room stat I guess. So would need to check if the condensing boiler has a built-in variable pump or not. Was going on what the alpha leaflet said:

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...

Just reading the Domestic Heating Compliance Guide May 2006 (from Office of Deputy PM): http://www.planningportal.gov.uk/uploads/br/BR_PDF_PTL_DOMHEAT.pdf Table 2 (p15) lists the minimum provisions for control of gas fired central heating systems, with a section for new systems (ie no...

Interesting, thanks. I'm wondering if this fitter has seen Part L lately, as he said don't bother with TRVs either. :? Good job I'll be getting a couple more quotes anyway. So having a Part L compliant cylinder is a requirement even when just replacing a boiler now or only if the existing...

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...

Just found this on the Worcester Bosh website: Which seems to suggest my guess that modern modulating condensing boilers have no trouble with TRV was right. Maybe all the negative comments about TRVs come from the non-modulating boiler days and not really an issue anymore. Thanks for the...

Found a post by someone in 2000 claiming to have got a reply from Central Heating Information Council (CHIC) about TRVs. Basically saying that suggesting TRVs prevent condensing is misleading as condensing boilers only condense anyway below 35oC return temp and that only happens on first firing...

Could be wrong, but my impression was that any new system install has to have controls which at the very least alllow a different temperature in the bedrooms compared to the rest of the home. Fitting TRVs isn't the only way to comply with that, but is the one suggested maybe as it's the...

*Moved question to a seperate topic*

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...

Thanks for the reply.

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...