@bami Is there some reason the room would have a lot of moisture in it overnight? If not that would kind of suggest the double glazing panel has blown and th window itself is cold. You usually see moisture between the two panes if that has happened.

@bontwoody 

It's not inbetween the glass but on the glass itself.  I'll do a bit more investigating!  I'm still getting used to the house, which has been a building site since I moved in.  Now all the rooms are done and the flooring down I'm now looking at how it actually functions and any issues.

Hi to all those who have generously replied to this thread.  I've now had another discovery.

The 3rd bedroom is always too cold.  I measured the room size and it is 3.4m x 3.6m, yet it only has a 50cm x 70cm rad. This is the same sized rad as in the tiny en suite bathroom!

The 2nd bedroom is fine.  It measures slightly smaller than the 3rd bed at 3.2m x 3.6m, yet has a rad sized 80cm x 70cm.

The installer contact has given me all the design & heat loss documents this morning at first ask, which is great.  Straight away I see on the schematic diagram that the room size for Bed 3 is wrong.  It's down as 2.4m wide instead of 3.4m (and strangely has no doorway!).  You can see from the bathroom below, which is 3m wide, that Bed 3 width is wrong. 

So the rad size in Bed 3 needs to be increased to an 80cm from a 50cm wide.  This cold room will be affecting the heat demands of the rooms either size, which won't be helping anything!

The room size for the Utility is also way out!  It's 2.7 x 2.4m, not 3.98 x 3.36.  No wonder it's always boiling in there, as the rad is huge!  Whoever measured my house was having a very, very, off day 🙄

If they've got my room sizes so wrong maybe that's why they've given me a ASHP which is too large for the actual square area of my property? 🤔

The condensation demonstrates that the curtains are very effective so the window gets cold. My bedroom has a fairly big (2.4m x 1.2m) north-facing window which was triple glazed a few years ago and gets some condensation in cold weather, but less than when double glazed. A hazard with 1970's construction is thermal bridging around the windows. I wouldn't be surprised if it's got an uninsulated steel beam as a lintel. An infrared thermometer quickly reveals the cold spots. The thermal bridging guide is full of examples of good and bad practice but is short of examples of how to retro-fit improvements. I've applied the Wallrock thermal lining paper around the windows as something that's better than doing nothing.

If there's a lot of heat leakage around the windows then secondary glazing set in its own frame away from the existing window will increase the path length for the heat loss around the window.

Edit 1: If there's drying plaster or concrete from the building work then that will have raised the internal air humidity.

Edit 2. Where is the garage with the cylinder? If that's at the opposite end of the house from the lounge then there will be heat loss in the pipework. You wouldn't be the first to suffer this problem. Restricting the flow through the lockshield valves in the other radiators should help more hot water reach the lounge.

@bami thats helpull. Did you also get the heat pump spec and heat loss calculation?

@bontwoody 

I can't see anything in the documentation that says it's a heat loss calculation but there's 20 odd bits of paper so I'll keep looking.

Attached is what I can see on the ASHP.

OMG, the attached schematics (even with incorrect room sizes) says it should be an 8kw ASHP, not 12!!

It's INSANE how wrong they have the sizing (and even shape) of my house on the schematics 😲

No sizing for patio doors

Missing window in bathroom

Wrong sized windows in BR4

Missing window in lounge

Missing window in BR1

Incorrect sizing of BR1

Incorrect sizing of En Suite

Incorrect sizing of BR3

Incorrect sizing of Utility

Incorrect shape of bathroom (and therefore sizing)

Incorrect sizing of hall

How has a proper heat loss calc been done on my property when all of this is, in some cases substantially, incorrect?!

Attached in an accurate schematic of my bungalow.  What has been labelled as BR4 is actually the integral garage - it's had the doorway bricked up and a window installed, but it's by no standards a habitable room.  It houses the new water tank etc. and is a workshop with 1 outside wall as yet uninsulated and a bare, uninsulated concrete floor.

Posted by: @bami

↑

It's INSANE how wrong they have the sizing (and even shape) of my house on the schematics 😲

No sizing for patio doors

Missing window in bathroom

Wrong sized windows in BR4

Missing window in lounge

Missing window in BR1

Incorrect sizing of BR1

Incorrect sizing of En Suite

Incorrect sizing of BR3

Incorrect sizing of Utility

Incorrect shape of bathroom (and therefore sizing)

Incorrect sizing of hall

How has a proper heat loss calc been done on my property when all of this is, in some cases substantially, incorrect?!

Attached in an accurate schematic of my bungalow.  What has been labelled as BR4 is actually the integral garage - it's had the doorway bricked up and a window installed, but it's by no standards a habitable room.  It houses the new water tank etc. and is a workshop with 1 outside wall as yet uninsulated and a bare, uninsulated concrete floor.

Perhaps just as pertinent is how their own measurements conflict with each other.

• If BR4 is 2.62m wide, how can the utility be 3.36m wide if they share the same internal wall line?
• How can the living room be 3.8m wide and BR1 be 2.8m wide at the same time?
• How can the utility room be 3.98m long if the kitchen is only 2.8m in the same direction? And how can BR1 (an obviously longer room) be only 3.41m long?
• If the length of BR3 (or BR2) plus the width of the hall plus the length of the kitchen or bathroom total 7.68m (plus wall widths), how can the lengths of BR4 and the utility room add up to 9.15m? Is the wall between BR4 and the utility room a metre and a half thick?

To my mind this all adds up to a dramatic lack of basic sanity checking. I wonder if any other forum members know what form of redress could be available under the HUG scheme; free the installation may be but the installer's miscalculations are going to cost you money on an ongoing basis surely there's a mechanism for the powers that run the scheme to haul the installer back to correct their mistake - Sale of Goods Act and all that.

In fairness, if the installer gave you the documentation without any prevarication it does suggest the mistake is an honest one. Who knows; they may be perfectly prepared to put their hands up, admit the error and resolve the issue with minimum fuss. I'll be interested to see how they respond.

@majordennisbloodnok 

Absolutely!  You only have to look at the plan to see the room measurements don't make any sense.

The chap who gave me the documents said "no clue!" when I mentioned the cold bedroom & incorrect sizes on the plan and said he'd pass my email on to the "technical guy".  He is clearly just a pen pusher and may have put the cat amongst the proverbial pigeons by giving me all the documents 😉

Consumer Rights Act 2015 will apply - my contract is with the installers rather than the Council.

Posted by: @bami

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OMG, the attached schematics (even with incorrect room sizes) says it should be an 8kw ASHP, not 12!!

 

it does, but the schedule says a 12kW in Im not too much mistaken:

So the documentation is not consistent.

Posted by: @bami

↑

Consumer Rights Act 2015 will apply - my contract is with the installers rather than the Council.

Indeed; I would recommend you focus on what's wrong/what they actually need to change 

It looks like the answer is: one or more radiators and probably the heat pump itself, but the inconsistent documentation the latter is unclear (although Id be pretty confident that 12kW is over cooking!).  Is there a loss calculation anywhere?  I would also check the insulation internally and externally!

Notwithstanding this making some changes in the mean time to how the system is operated should help if you are able/willing.

@jamespa cannot find loss calculation.  When they get in touch I'll query it.