Condensing boilers: getting the return temperature low enough

Tim Streater · 2012-03-21T09:41:17+00:00

We're expecting to replace our oil-fired boiler this summer and so will have a condensing one. I read that to be most efficient, the water return temp from the CH needs to be around 55C. Are there ways to achieve this without mucking with the CH pipework? Will just closing all the lock-shields a bit more do the trick? I couldn't see this anywhere on the Wiki but I mat have missed it.

Mar 21, 2012 22 Replies

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Man at B&Q 14 years ago

Controllable ones are PMSM with appropriate drive electronics.

MBQ

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Tim Streater 14 years ago

I just looked at my water pump to get the name/model. It's a Grundfoss Selectric, you could just giggle for that to find out how it works. It has a three position switch that controls the rotation speed.

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Dave Liquorice 14 years ago

Maplin did have a two thermocouple thermometer for not many notes, donno if they still do. Does F and C, T1, T2 and T1-T2.

Couple a large croc clips lined with firm foam make for quick attachment of the thermocouples to the radiator stubs quick and easy.

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