New home woes with heating

[Sg1973]

Hi all

Looking for some advice if possible. Whilst it's too late to tell me not to buy a new house - not something I'm likely to ever do again in a hurry - I suspect the builder has gone for cheap, or low cost kit. The house has EPC B, concrete floors downstairs (supposedly insulated underneath), cavity wall insulation, brick construction, double glazing (upvc). It's a 4 bed detached with a conventional boiler and hot water cylinder and separate thermostats and timers for upstairs and downstairs.

Potterton promax 12 and pretty small radiators have been installed. The front lounge, 5x3x2.46m, has a 1.7x1.4m window and two external walls. The radiator is 800x600mm single, so about 2800BTU. The thermostat in the hallway struggles to get above 19 (and stays below 18 unless the heating has been on for hours) and the lounge reached 21 degrees after the heating had been on for over 6 hours. When I was in the lounge with my daughter yesterday, the heating had only been on for an hour and we had to sit by the radiator to feel any warmth. Same story in the master bedroom.

The boiler thermostat is set to max as are all the radiators (thermostatic valves), so I'm worried that there's no capacity to heat the house to a sensible temperature without having it on all the time, which seems to defeat the object of an efficient home.

They claim they used a specialist heating company but of course they might have been given a brief to save as much money as possible. It's unfortunate but it's a detail I wouldn't have expected to need to go into prior to completion. From what I've read, it's usual to be over cautious when installing a system. Right now, the house feels cool within the first 2-3 hours of the heating being on.

So, are there any requirements or minimum standards to be followed? Is there any company I could use to mount a challenge to the builder? Or am I screwed?

Clearly, installing larger radiators might take the boiler beyond its limit so it's not a cheap proposition to change things myself.

Thanks in advance.

Sean

 

[ShaunCorbs]

if they claim to have used a spec heating firm ask to see there heat loss and rad sizing calcs

and boiler sounds too small

how many rads in the house?

and if your unsure post the room sizes up and window sizes

 

[Unregistered]

Thanks

Downstairs there's a radiator in the 5m x 3m lounge, small study 2.6 x 2m, downstairs cloaks 1.2 x 2m, hallway and two in the open plan kitchen/lounge/diner that's 4.3 x 4.1m max, and one in the utility room 1.5 x 1.7m. The kitchen area is where the only double radiator in the house exists. Upstairs landing, 4 bedrooms and 2 heated towel rails. So guess that's 12 radiators and 2 towel rails.

All bedroom windows are 1.3 x 1 m. Study window is 1.3 x 1.4m. Kitchen window also 1.3 x 1m and the rear lounge has bifold doors around 2.1 x 2.1m.

Rest assured, once I'm through the Christmas period, I'll be asking to see their calcs. If they provide them, what options would I have then?

 

[chris watkins]

Hi Sean
First thing is to request a copy of the heat loss calculations & rad sizing from the builder/main contractor. (is this house part of a development or a one off new house ?)

Hopefully the system should have been designed to BS EN 128228 :2003 & BS EN 12831 :2003

It is possible to employ an expert designer either a Heating engineer or a mechanical / heating consultant you can provide a report on the installed system to mount a claim if it is not up to standard.
Do you have NHBC warranty or hold any retention ?

 

[newcastle phill]

If it is a new build you should seek an independent report from a building surveyor and approch the builder with the findings

 

[ShaunCorbs]

please log back in and is there a rad on the hallway and dont think you listed your bed room sizes

 

[jtsplumbing]

System sounds to small for house, 4 bed house you must have at least 10 radiators average 1.5Kw per rad = 15Kw + hot water min 18 Kw boiler

 

[stevetheplumber]

i wouldnt worry about their calcs just get a surveyer /consultant to do a heat loss calc for you so you can see if your existing system is up to standard then take it from there
i does sound small for the size of the property i would think a 24k boiler would be more likely
where abouts are you their may be someone here willing to take this on

 

[Unregistered]

Thanks all. Didn't see the notifications for updated posts but much appreciated to get so many responses on Christmas Day!!

Radiator (small obviously) in hallway. Sorry for not listing bedroom sizes. Here they are:

Master 4.7 x 3.8m max
2 4.6 x 3.6m max
3 3.6 x 2.9m
4 3.5 x 2m
bathroom 2.5 x 2.1m
en suite 1.8 x 2m

I can post radiator sizes later but with family at present.

I'm in Leeds (the Yorkshire version) so open to offers on here if someone is interested.

It doesn't have NHBC but instead has Premier guarantee.

To put this into context I am also really unhappy with the finish of the woodwork (not to mention they didn't get the kitchen floor level and even failed on their first attempt to fix it) and intend to be talking to the solicitor who handled the purchase early in the new year. The builder's website suggests a very high spec and quality craftsmanship but I've seen none of that. They are a small builder who generally build about 12 houses on small developments (like mine).

I've produced a snagging spreadsheet that had close to 150 points and they've so far resolved less than 20 of them. I've lost the will, quite frankly, so also considering hiring a professional snagging firm to see if there are more major defects. Any advice on this also welcome but understandably this is a plumbing and heating forum so no need to respond to this too.

Thanks again. And merry Christmas.

Sean

 

[Sg1973]

Looks like I wasn't logged in when I posted that last message. Oops.

 

[ShaunCorbs]

right now these are partly from you and estimated by me but they should be close enough, but without seeing/ measuring for my self just use these as a starting point

Lounge: 5m x 3m x 2.5m
Window: 1.8m x 1.3 m (guess)
2 Outside walls (guess)

Total Room Heat Loss: 1580w
K1: 1800 x 600mm
K2: 100 x 600mm


Study: 2.6m x 2m x 2.5m
Window: 1.4m x 1.3 m
1 Outside Wall (guess)

Total Room Heat Loss: 556w
K1: 600 x 600mm
K2: 400 x 600mm


Downstairs Cloaks: 1.2m x 2m x 2.5m
1 Outside Wall (guess)

Total Room Heat Loss: 594w
Towel Rad: 1400 x 500mm

Kitchen/diner: 4.3m x 4.1m x 2.5m
Window: 1.3m x 1 m
Door: 2.1m x 2.1 m
2 Outside Walls (guess)

Total Room Heat Loss: 1034w
K1: 1200 x 600mm
K2: 800 x 600mm


Utility Room: 1.5m x 1.7m x 2.5m
Window: 1.m x 1 m
1 Outside Wall (guess)

Total Room Heat Loss: 239w
K1: 450 x 450mm


Bedroom One: 4.7m x 3.8m x 2.5m
Window: 1.3m x 1 m
2 Outside walls (guess)

Total Room Heat Loss: 994w
K1: 1200 x 600mm
K2: 600 x 600mm


En Suite: 1.8m x 2m x 2.5m
Window: 0.8m x 1 m
0 Outside wall (guess)

Total Room Heat Loss: 465w
Towel Rad: 1200 x 500mm


Bedroom Two: 4.6m x 3.6m x 2.5m
Window: 1.3m x 1 m
2 Outside walls (guess)

Total Room Heat Loss: 933w
K1: 1200 x 600
K2: 600 x 600


Bedroom Three: 3.6m x 2.9m x 2.5m
Window: 1.3m x 1 m
2 Outside walls (guess)

Total Room Heat Loss: 644w
K1: 800 x 600mm
K2: 450 x 600


Bedroom Four: 3.5m x 2m x 2.5m
Window: 1.3m x 1 m
2 Outside walls (guess)

Total Room Heat Loss: 481w
K1: 600 x 600mm
K2: 450 x 600mm


Bathroom: 2.5m x 2.1m x 2.5m
Window: 1.2m x 1 m (guess)
1 Outside wall (guess)

Total Room Heat Loss: 593w
Towel Rad: 1600 x 500mm

 

[Sharp Point]

Good evening,

how new is the house, when was it completed? As new build houses that have been built very quickly and still saturated with 1000's of litres of water, take a while to heat and lose there heat quite rapidly until the thermal mass starts drying and holding the heat.... Bit like a sponge!
I would get the heating checked by a independent heating engineer first, to measure temperature differentials at rads, check system is balanced and all valves are open, bypass's set. You may have a large cylinder that takes all heat if heating is on too!! ( water takes the path of least resistance) these are basic checks. A 12 kW boiler would roughly be suffice if heating( radiators) was on alone.

My two penneth.....

 

[Sg1973]

Hi

Thanks again. I did wonder about the newness. I moved in a couple of weeks ago so plastering will be a month or two old only. I guess it's plausible although there were 2 rads for the lounge on the original drawings but pre completion I noticed the larger rad was missing. They claimed that revised thermal calcs showed that one rad was sufficient (but said that they would be obliged to give me both as it was what was signed for). I had no reason to doubt their calcs at that point but after living there for a week I asked if they could just fit the larger rad in place of the smaller one. I'd probably get them to swap that for one of the other smaller ones. They haven't come back to me yet but I do wonder if a larger rad will take the system beyond the capabilities of the boiler.

Forgive my cynicism but they haven't covered themselves in glory so far and my gut feel tells me they have looked to cut costs in many areas. It could be legit but I'd feel happier getting a second opinion.

Forgive my ignorance but what is K1 and K2?

 

[ShaunCorbs]

Hi

Thanks again. I did wonder about the newness. I moved in a couple of weeks ago so plastering will be a month or two old only. I guess it's plausible although there were 2 rads for the lounge on the original drawings but pre completion I noticed the larger rad was missing. They claimed that revised thermal calcs showed that one rad was sufficient (but said that they would be obliged to give me both as it was what was signed for). I had no reason to doubt their calcs at that point but after living there for a week I asked if they could just fit the larger rad in place of the smaller one. I'd probably get them to swap that for one of the other smaller ones. They haven't come back to me yet but I do wonder if a larger rad will take the system beyond the capabilities of the boiler.

Forgive my cynicism but they haven't covered themselves in glory so far and my gut feel tells me they have looked to cut costs in many areas. It could be legit but I'd feel happier getting a second opinion.

Forgive my ignorance but what is K1 and K2?

k1 single panel with single fins
k2 double panel with dual fins

 

[Geyser]

Why are some plumbers fitting small rads still? not much more for exact size or larger which works better with condensing boiler at lower temp. Large building companies i expect saving pounds on install and costing homeowner thousands in the end.