Incorrect Boiler Size

[bengasman]

What boiler was removed?

 

[Extensionwoes]

A potterton but I don't know the model. I now have an alpha 24. House was cold before and is still cold downstairs. We have 2 bathrooms with baths and 1 shower (large tank). Like I said, I know nothing about plumbing.

 

[bengasman]

Not an old manual lying about somewhere? Repair bill with spec? Photo?

 

[doitall]

How long is it on for.

Lets have some measurements and we can tell if it's undersized.

 

[Extensionwoes]

Found some plans! Length is 9.17 metres, width is 9.75 metres. Then there is an extension which is 3 metres long and 4 metres wide. We are on 2 floors and then we have a loft conversion too.

Thanks once again!

 

[Extensionwoes]

New boiler was only fitted in June so it hasn't been running long but put it on in June in the evening and it still felt cold - bearing in mind the guy who installed it told me it would heat next doors house too (and we are detatched) I expected to really feel it!

The radiators that were changed were double but didn't have the bits in the middle so that's why they were changed. I had previously had british gas in who also told me radiators were of suitable size and amount.

 

[Extensionwoes]

Do you really think you have an actual problem or are you just trying to find points of argument with the builders? I hope that you are not just trying to find excuses not to pay them?

Tony

Tony,

I just want it to be right - I have already paid them!

 

[bengasman]

Can you give me a list of your radiators, width, height and single or double?

 

[Extensionwoes]

Can you give me a list of your radiators, width, height and single or double?

Will post in the morning as the kids are all in bed. Thanks very much for your help.

 

[doitall]

Ok, according to CHeSS 54 whole house heating, which makes a few assumptions, which I can post if you want them.

Detached house.

Three floors. Average ceiling height 2.6m

Filled cavity ( not sure about that one)

Pitched roof with 50mm insulation (assume it meets the regs in the loft conversion)

Location North + Midlands.

19.85 Kw which includes 2Kw for hot water, again I assume it's not a combi, did you post the boiler make model.

I may have been light on the extension, depending on construction, and the glass area, but I allowed 2.3Kw as if it were cavity wall.

 

[Agile]

So my 24 kW was totally adequate with 20% extra capacity.

Actually until you have the walls are insulated you may need it.

But these figures are for when its -1 degree outside !!!

Tony

 

[doitall]

I think the north/midlands may be slightly more than that Tony.

It does assume that all the rooms are heated to 21 C. Which I think is low for the lounge & Bathrooms, and high for the bedrooms.

 

[Extensionwoes]

Ok, according to CHeSS 54 whole house heating, which makes a few assumptions, which I can post if you want them.

Detached house.

Three floors. Average ceiling height 2.6m

Filled cavity ( not sure about that one)

Pitched roof with 50mm insulation (assume it meets the regs in the loft conversion)

Location North + Midlands.

19.85 Kw which includes 2Kw for hot water, again I assume it's not a combi, did you post the boiler make model.

I may have been light on the extension, depending on construction, and the glass area, but I allowed 2.3Kw as if it were cavity wall.

Thanks!

Cavity is not filled, loft is not to building regs (long story), no it isn't a combi. We have 3, 6 panel large bay windows, largish windows elsewhere and in the extension 2 walls are windows/bi-fold door.

Does any of this make any considerable difference?

 

[Agile]

The filled cavity would probably add about 20%.

If you have a loft conversion then that has probably got very good insulation.

Other parts are OK if they have 100 mm but you could upgrade that as a DIY job or its very cheap for someone to do it for you.

Tony