Recent content by This 70shouse

Doesn’t the 15 refer to the diameter of the inlet? You can’t put a 25/80 with pipes that are 15 can you?

No. Both boilers are condensing on a sealed system. Last one was a bit less powerful (30kw) but was installed before an underfloor heating system and large extension was built.

Sorry I don’t follow you? Old boiler and pump generally worked fine until the old boiler died. So we didn’t have a lot of choice about needing a new boiler!

Thank you. Interestingly the underfloor heating is on constantly maintaining 18 degrees on the thermostat and that doesn’t trigger the fault. It seems to be when the heating clicks on either on the schedule or when it’s been off for a while on the thermostat. It always works fine after a single...

Hmm. I’m not sure it is oversized. The house is detached 3 storey with 6 bedrooms. The underfloor heating is heating a room which has a really huge ceiling (5.5 metres high). Pretty large heat loss because the roof insulation isn’t great. Lots of plumbers advised us to go 35kw. But worth...

Thanks Picasso. That is very helpful. So would that explain why after a single reset it always works?

Thanks Picasso. That is very helpful. So would that explain why after a single reset it always works?

And it’s 13 rads plus underfloor heating circuit heating largish room.

Sorry. That’s what the manual said! It’s a 435. Plumber has turned output down a bit but hasn’t solved the issue. Boiler is new. Pump is 4 years old.

Hello, it’s an eco tech pure 412-435 and the pump says Grundfos UPS3 15-50/65 130 appreciate any wisdom you have. Cheers

I’ve just had a new valiant boiler installed (sealed system). It faults (F23) a couple of times a day. Seems to be when the boiler fires up. The pump seems to be working ok in that all rads get hot in good time. It always runs fine after a single reset. Could it be that the pump isn’t working...