Recent content by steveoldgit

Ashamed to admit I had to Google TRV, but now I know, no, I don't have Thermostatic Radiator Valves. We have lived here for about 27 years, and the ch part of the system was already installed when we arrived. It is quite basic but works fine, so I don't want to b###er about with it unless I am...

Ignoring p###takes for the moment; 1) no, there is no bypass. Don't know why, probably another function of the way the system 'evolved'. When the tank stat stops calling for heat, simultaneously the boiler and pump stop, and the solenoid in the zone valve de-energises, then the spring...

Sorry, Your Worship :?

Mr Hailsham Thanks. The pipework entering/leaving boiler is all 22mm, and reduces to 15mm after tees (It's not quite as simple as that, but in essence) so I think the flow rate is OK. It's not noisy all the time anyway, just when the hw valve closes and the head of water upstream of...

Boiler is Ideal RS50 output to water is 14.7 KW. Salient point is that the water hammer didn't occur in exactly the same system until the Grundfos pump was changed. I think the pump performance was up a bit on the old pump, but it was the nearest available to the old Grundfos, and I...

Thanks for quick response, Mick. Yes, it is right to circuit diag. hw valve is on flow, rads valve is on return (wierd system because it came about in three stages; ch first, hw later, and boiler change later still. Pump change was years after that) There are yards of 15mm pipe full of...

My c/h system is 10mm, and hot water system 15mm added later (years ago) with one Honeywell open/closed valve on rads circuit and one on hot water circuit. Since fitting a new pump 2+ years ago (direct replacement as near as I could get) there is a single water hammer each time the hot water...