That's brilliant Kev. How exciting, and April 5 is just around the corner. Detailing your progress will be super useful for others to read.

Question about your rads - did they recommend upsizing any, or will that only be revealed next week when you get your heat loss calculations? Also, are your rads K2s?

Look forward to the update on Monday.

Mars, no upsizing as such as we don't have any rads at the moment.  The quote we got says all rads will be Stelrad K2.    

@kev-m, nice. From what I've heard Stelrads are awesome. We've just ordered five K3s for rooms that are not coping with some K2s and some single core rads. Hopefully they'll be fitted in the next month.

hi, just been to see our building work and the guys have put the 'pipe' in place ready for the pump to be fitted. I'm no expert but was impressed with the contents of the pipe. If there is an expert on here that can comment and let me know what they think. TIA.

@kev-m

I will be watching this thread with great interest.  The same company have quoted us and, apart from the size of ASHP, the rest is identical.  I hope your install goes well and does as you hope 🤞.  Did you have any other companies quote you?

@morgan, yes I got a quote from another local company.  They didn't visit but based it on the EPC and a floorplan I sent.  It was £16-17k all in (dependent on survey/requirements) but they didn't give specifics about ASHP/cylinder size or manufacturer.   

@kev-m

Strangely I’m struggling to even get responses.  I leave a message re contact on web sites and nobody gets back.  JL Phillips are the only one so far.  The same applies re wall insulation.  Quite odd really.  I have to say that Rob from Phillips impressed me greatly and the seem to be a very experienced company.

I think a lot of companies are busy with GHG work? I don't know. 

Anyway, I got an email this morning asking of they can install a week earlier due to a postponement, so that's Monday 29th for 2 days, which is fine by us (just about).  We'll need to get our skates on with the prep work though; storage heaters, towel rails and even some kitchen cupboards to be removed and made good.  I've already had to replaster one wall; hopefully won't need to do more, just some minor repairs.  Anyone want over a tonne of firebricks? 😉  

This is the ASHP, which arrived this morning as planned.

And this is where it's going.  I built a concrete plinth about 1100x850mm.   The back of the ASHP needs to be 330mm from the wall. The kitchen is the other side of the wall.  The nearest house facing that wall is about 40m away behind a huge laurel hedge and fence. It's on the side of the house but not visible from the front as our garage is in the way.   

@kev-m, that's brilliant. It's all taking shape and on track.

Wow looks like it will be soon time for installation day . Hope all goes well ! Will watch with interest see how you get on , good luck 🤞! 

An update.  I have spent a lot of today going through the heat loss and radiator sizing calculations that our supplier sent us (on time as promised) yesterday. Any worries I had that the system might be undersized and/or the radiators wouldn't be able to cope with the low temperatures are gone.  It's all calculated on the MCS spreadsheet and you can see exactly how everything is worked out.  We ended up with three more radiators than on the original quote.  Our living room now has three (it's quite big at about 40m2) and we have two in the hall instead of one (a bungalow hence a big hall). One of the bathrooms has a radiator instead of a towel rail.  I had some questions for the supplier, which they answered, and I'm as happy as someone about to pay out over 16 grand can be! 

The heat loss was worked out for each room with standard room temps (19-21 deg depending on the room) at -3 deg outside and radiator sizing at an average flow temp of 45 deg (50 out and 40 back).  This will vary according to outside temp so will hopefully be a lot less most of the time.  DHW is 50 deg with the usual legionnaire boost. 

The radiators are all Stelrad K2s; so double panels.  They are bigger than those for a 'normal' heating system but not excessively so.  The smallest is 1000x600 and the biggest 1400x600 with a couple of sizes in between.  They are bigger than the storage heaters they are replacing but then that means they'll cover all the repairs/cracks underneath!

SPF on the certificate is 3.3.  If we average anything over 2.5 I'll be delighted because that would half my heating and DHW costs. We'll see.  RHI will be the maximum at about £1500/year based on the EPC. 

That's about it for now I think.  I've just removed the last of the eight storage heaters (a horrible job with crumbly 40 year old insulation and accumulated dust).  The cylinder is coming tomorrow and everything starts on Monday.

I'm looking forward to it all being done!

Kev