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Some useful referance material there, thanks. I guess I'll try the larger Wilo 60 which is similar to the Grundfoss version and I'll let you know how I get on. I suppose having 3 speeds on most pumps allow some flexibility if you get it wrong. Happy New Year to all. Regards, Dennis

Hi Guys, Some more facts. Outside temp now -5deg C. Boiler flow is 55 rising to 65 when it cycles, return is 45 not rising much more. All rads have trv's except two close to the boiler. These are well balanced. The problem rads after a long time reach 55 to 60 flow with return about 35 to 40. I...

Hi Simon, It is a Mistral 56kw according to the plate. It is a closed system and yes the house has been extended. The house was professionally redecorated throughout since the boiler change and the radiators were removed so I don't believe the system was re-inhibited when they were put back...

Hi guys, Thanks for your quick replies. Rough calculation is about 40kw. 19 rads all high water content double panel and one towel rail. It is a large country house 5 double bedrooms, 4 bathrooms etc. The domestic hot water is currently timed to come on only after the house is up to temperature...

How do I size up the pump required for 56kw oil fired fully pumped ch. 20 rads, large 5 bed, 2 storey house? The pipes and rads are about 20 years old and the rads furthest from the boiler take a long time to get up to temperature. The boiler is three years old. The system is reasonably well...