Gav_P

My place is built very similarly to yours... except the main house was done over the last couple of hundred years and I’ve tried to improve the air tightness and insulation whilst reconfiguring and adding a new extension. I’m interested in the advice that comes forward on this... ? p.s welcome to the forum... it’s been indispensable for me!!

Funnily enough he seems to have inspired someone else in our village to do the same. They are in the process of applying for outline planning for 4 large exec homes, and they seem to be taking the same approach to Mike. South glos planing PT16/6161 Mikes is PT16/3579

I had a very interesting chat yesterday with @MikeR regarding his progress on his group selfbuild. He has done exceptionally well and has outline planning agreed for 9 good size self builds. And having dealt with South Glos planning, I know how difficult they can be! He has his required 8 other owner/builders onboard and they are all in various stages of their design. But it will be a collection of high end contemporary design.

The p***s plumber strikes again!

The wire running vertically is just passing the box on the left hand side isn’t it?

Have they just fitted the floor glass in the wrong order? The end piece looks shorter.

What have you got on the walls within the fireplace? Is it wet plastered, board and skim, fireboard? If its its any form of plaster it will definitely crack with the heat generated by the stove.

I’m in Westbury Park everyday... just across the downs from your neighbourhood.

I just found this thread... @MikeR how are you getting on with this idea... I’m only a couple of miles from you and very interested in the concept. @pocsterI have read through several of your horror story threads and only just realised that you are in brizzle too! What area is your underground bunker? Have you put your plans on here?

Stupid question... are you sure you have it wired up right? If if it turns on when you crank up the room stat, then this isn’t what you want is it? The room stat should just do the UFH pump and actuators. The TS should trigger the ASHP to switch on. There is the 3rd element to consider... is the command unit acting as a stat without your knowning?

Does the command unit report the temps it is getting from all the sensors in the unit?

Is the TS still calling for heat? Or has the demand stopped? if it’s still calling for heat, then it’s almost definitely a HP related issue.

Understood. And that applies in my situation 100%. But joes seems like it’s limiting itself to 25’.... probably something to do with the pissing about with the command unit ?

All the programming aside, shouldn’t it be as simple as @joe90 asked? I.e. the thermal store is asking for heat (upto 40’) and will keep asking until it reaches temp. The ASHP should keep incrementally increasing the circulation temp until it reaches its max parameters (40’ or 45’ depending on what joe has set it to) or until the demand is met ? Am I simplifying too much?

I don’t have a buffer tank, so the demand is from the UFH, which is 22’ (room temp). i also don’t have the command unit, so the ASHP is running the standard heat curves. Interestingly it doesn’t ever seem to be working very hard... I assume the room stat is calling for only a degree or 2 of heat so doesn’t take much to bring the UFH back up to temp. I haven’t seen any signs of icing, even in single figure temps with fog etc.

Temp differences for me can be up to 10’ between flow and return, however it’s normally much less only a couple of degrees.

Yeah what he said! ?

@joe90 I don’t think I’ve seen mine get an output temp above 30’. Normally only about 25’

Where can we see the plans?... photos look amazing BTW... you should be very pleased with yourself right now!

@Nickfromwales & @ProDave ah I understand. In that case, yes it has the input group with the balanced cold feed to the rest of the house (except outside tap). It is is a new (middle of last year) install, done as part of my building works. But access was very different at the time as no plasterboarding has been some. The PRV on the cylinder was the one I mentioned above and that is accessable enough to test. The PRV on the input group is a bugger to get at, but is currently about 250mm from the UVC. Moving this to somewhere more useful would put it about 1500mm away from the cylinder, so a bit of a no go. I think I’ll just move the EV and add one of those lockable service valves recommended by Nick. Thanks Chaps

The PRV is accessable. It’s just there is virtually no space to get at the vessel, never mind get anything on it to pressure check it. What’s ‘the input group’?

Thanks @Temp , so if that’s the case, I just add a couple of metres of pipe from the existing take off point. Simples.

It seems to be a fairly common approach for self builders to use a manifold based installation. I wish I had seen this forum before I started my house... especially when I discovered one of my joints leaking in a ceiling. ??‍♂️ I’ll definitely put a manifold distribution in my next house! ... and a nice pretty one too!

I see what you mean... in this day and age there are a lot of better looking stats... and ones that you can programme in a ‘not to exceed’ temp (to stop others in the family cranking it up to max!)

What does it look like?