Chriss

This is my problem, I don’t understand what the 25 nominal size means, If I look for a 25 70 130 it’s much more expensive than say a 25 80 130. I can find a 40 70 130 at a good price but is a 40 not good, does it need to be 25? Excuse my ignorance it’s just very hard to find the information on that. Even my plumber friend was unable to help me.

Cheers I’ll look into that. Do you think the pump I’ve put on isn’t strong enough and the one I’m thinking of buying would be okay and better?

Hi I didn’t run my circulation pump since last winter as it is only used with the ASHP and that is only used to heat the underfloor-heating. I didn’t realise it was at risk of rusting and seizing up which it has done. I had another circulation pump in the house so switched them over but it clearly isn’t strong enough and the floors aren’t heating up anywhere near as well and I’m unable to adjust flow rates properly. The original pump came as part of a kit, the problem is if I want to buy the exact same one it’s pretty expensive. I have attached pictures of the original Grundfos pump that has packed in, the pump currently on the manifold and a pump I was thinking of buying, my question is the pump I’m thinking about buying ok and would work better. Many thanks Chris

Thanks for the replies, I really appreciate it. My partner was in touch with an underfloor heating and heat pump specialist yesterday who explained everything. Basically we have had shit advice from the start. He confirmed that our pump is way oversized, he advised on the exact pump to get and where to find it for the best price. Pretty gutted but at least we know now and can get it sorted soon. Looks like the kitchen will have to wait! cheers

I have been renovating an old barn in France, 125sqm. The kitchen sitting room and 1 of the bedrooms have large ceilings. The walls in sitting room and bedroom have been pointed, so no insulation on them. My sons bedroom is really well insulated everywhere as is the bathroom and en-suite. We have large window doors throughout the house. I will attach some pictures. I bought my heat heat pump from a website in the uk Dream heat pumps, as it was reasonably priced. Unfortunately I don’t have a never ending pit of money and couldn’t afford an expensive heat pump. I will also add a picture of the specs of the heat pump taken from the website. cheers

I have been renovating an old barn in France, 125sqm. The kitchen sitting room and 1 of the bedrooms have large ceilings. The walls in sitting room and bedroom have been pointed, so no insulation on them. My sons bedroom is really well insulated everywhere as is the bathroom and en-suite. We have large window doors throughout the house. I will attach some pictures. I bought my heat heat pump from a website in the uk Dream heat pumps, as it was reasonably priced. Unfortunately I don’t have a never ending pit of money and couldn’t afford an expensive heat pump. I will also add a picture of the specs of the heat pump taken from the website. cheers

Thank you for the replies I really appreciate it. I sized the heat pump to the cubic metre of the house as I was told to by a couple of people. The house is 125 sqm but with huge ceilings. I didn’t know the amount of zones would be a factor also. If I was to add a buffer tank, how big of a tank would I need to buy and would I then be able to regulate the flow at the manifold. cheers

I have 7 zones, no buffer tank yet I hope to sort one out next year I just don’t have the time this year. Temperature on heat pump set at 40. I don’t think it is over sized as I worked out the cubic metre of the house before I bought it and if anything it’s slightly undersized.

I have underfloor heating running off a 15kw heat pump. The heat pump runs fine when the 6 lines are all fully open but the flow is obviously running too fast for the floor to heat properly. The problem is when I adjust the flow valves to reduce the flow the heat pump sstops straight away and says flow fault. I have a circulation pump on the manifold and have added an extra circulation pump. Would adding another circulation pump at the heat pump itself help solve this issue or could it be another problem. Any help would be greatly appreciated. cheers

Hello folks I hope someone can help me. I am renovating a barn and have installed the water underfloor heating myself and have screeded but I forgot about the sensor for the thermostat. Where exactly is the sensor supposed to go. The lead is not very long and basically just reaches the floor. Do I just drill a hole in screed and place sensor in hole. I really hope this is the case as I have pretty much done the tiling as well. Any advice would be greatly appreciated. Kind regards Chris