EdieCampbell

(I am chasing the architects and builders, but it’s the weekend and they’re not in the office, and it’s freezing and and and ….)

Not my project in some senses - I commissioned an architect to build it. I know, strictly speaking, this is a forum for self-builders, but you seem a knowledgeable bunch.

Oh forgot to add - the hot water is working. There’s always a good supply of DHW. So something is working.

I got it wrong - it’s actually the Kampman Kathern NK system. I hope the same. It should have been properly spec’d by an M&E specialist but I’m having serious doubts. I read elsewhere that the thermostat should be set reasonably high (I.e not the 16 I have mine at), to reduce cycling. I don’t even know what cycling is, but do you have opinions on this? I’m feeling utterly deflated that the house is just not heating. It’s been calling for heat all day, and has produced none. The outside temperature has come above freezing now. This morning at 7am the heat pump was frozen solid without the fan working. It’s now defrosted and the fan is going. The rooms are all still calling for heat, in the past 5hours it’s managed to produce an increase of about 0.5 degrees in each room.

Thankyou, I’ll have a play

Natural convection. I think it’s manufactured by Verano, but I’d have to double check that

That was my reaction. Having done some very superficial research. the radiators aren’t wall mounted - they’re coiled trench heaters. it’s a new build, but bespoke and should have been properly spec’d. I’ve asked my architects the question about UFH vs rads, as during the build there was a discussion about the two options, but I can’t remember the details. Obviously it’s the weekend so I’m waiting for a response from them!

It’s a compact 4 bed bungalow, can’t remember exact square footage but 2500/3000 sqft

Rads are warm to touch but not very warm. airtightness should be pretty good - new build bungalow that is mostly triple glazed glass. I don’t even know what size heat pump I have. I apologise again for my ignorance Im attaching images of the unit - it’s pretty frozen over too. I guess it’s spending all its time defrosting.

I’m gonna have to apologise in advance for my ignorance on this! (And if you know of some useful guide that can bring me a bit more up to speed on ashp functioning, that would be much appreciated. I’m trying to troubleshoot and learn about the system at the same time) how do I see what my flow temp is? no idea what calculated heat loss is. have rads, no UFH

Interesting, Thankyou. I’m asking my architects to refer back to the M&E spec to try to get to the root of the problem. As an example, last night my bedroom was 14.5 degrees, and calling for heat to get up to the required 16degrees. This morning it’s 13.9degrees and still calling for heat. My smart meter says I have been consistently using between 2.5-3.5KWH every 30 minutes all night.

I have a new build house, completed January 2021. No gas available, so the house has a Mitsubishi Ecodan ASHP. I then have a second Ecodan to power ancillary accommodation. Initially, having come from a gas boiler 1bed flat, I treated the house as if it was still running off cheap, quick-reacting gas. So I had to alter my behaviour, obviously. All fine for a year and a half until this cold snap. My radiators are constantly calling for heat, the house is cold, my kWh usage is very high considering I have my thermostats set to 16degrees, and most rooms are currently measuring 14/14.5 degrees. What am I getting wrong?! It feels like something has either been poorly spec’d, poorly installed, or poorly commissioned. I’ll be the first to admit I have a limited understanding of how heat pumps work, but I am slowly getting to grips with it. Any leads or suggestions gratefully received!