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Some more answers (or non-answers): In the loft, there are only 2 tanks - one for cold water, and the other (about 20 litres) which I believe to be the central heating expansion tank. Using a ruler, I'd say a bit less than 20mm - maybe 18mm? There is one small rad fed by microbore for some...

There's a label that says 'Potterton Profile 80 NG". Does that help identify it?

I'm not sure if I was supposed to know this technical stuff when I originally posted, but a lot of it I don't (like pipe sizes and manifolds etc). But I can at least ask Plumber B about it when he's available. He's not working this week, and Plumber A isn't returning my calls. Some things I can...

Answering a no. of questions here: 1. The boiler cuts out prematurely whether on HW or CH 2. The new pump is a BritTherm 15-60/130 3. Don't know if there is an auto-bypass or not - is that easy to establish? 4. I fully accept the need to upgrade the boiler - but the priority is to get the...

I have a 12 radiator house serviced by a 22+ year-old Potterton Profile boiler. I have what seems to be a compound heating issue that two separate and quite competent (I believe) plumbers have been unable to diagnose or so far repair. Here is the sequence of events: A couple of years ago, we...