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Hi all, A friend has a Grundfos UP20-15N pump to circulate the hot water and save wasting water while waiting for the hot stuff to arrive. Well, the pump failed and, when we opened it, we found the plastic impeller seized solid in the stainless housing. It's gunged up solid and impossible to...

Hi all. Wonder if anyone can suss this one? I have an old Thorn Apollo boiler, in a system with 2 heating-zones, with Honeywell 2-ways and roomstats and a hotwater zone with Honeywell 2-way and cylinder-stat. No programmer or clocks. Only using HW now, of course. Replaced the overrun stat a...

Hello all, I'm having trouble with the pump-overrun system on my old balanced-flue Apollo. The run-on time was getting longer, eventually reaching 25 minutes. I had an Interpart replacement fitted, No 402S088, although the number in the original instructions (1981) was 402S087 - the supplier...