What heating system for extension? Advice please

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We are planning to build an extension on our side return, and then install bifold doors of approx 3 metres at the back of the house into the garden. The room with the bifold doors would be the playroom , with a utility room leading off and a large toy cupboard.
I've been reading through old posts about underfloor heating as I thought that might be best given the kids are still small enough to be crawling around. Reading through the posts though, it seems that underfloor heating might not be that effective where there is a big glass expanse. Any suggestions? Would I be better off with uf heating and maybe a radiator as well , or think of something else entirely?
Room dimensions are approx3.4 m x4m

Thanks
 
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Unless its a proper extension then forget using it in winter.

If to full specs then UFH will be OK.

Get the architect to tell you the heat loss.

UFH can only give about 150 W psm!

Tony
 
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Unless its a proper extension then forget using it in winter.

If to full specs then UFH will be OK.

Get the architect to tell you the heat loss.

UFH can only give about 150 W psm!

Tony

Maybe a wee bit less Tony, we normally try to limit it to 100W/M2.
However, there's always the walls & ceiling. Radiant heating in the ceilings & wall is easily done.
 
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Thanks very much, it is a proper extension, one more question though- what does 100w m2 actually mean, heat wise, compared to a radiator? I'm generally cold so will this get warm enough for me to be in a tshirt? Or will I be in extra jumper territory?
 
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A typical room 3 x 3 needs about 1 kW. Thats about 110 w/sqm.

Read all the posts about UFH as it does have some disadvantages!

Tony
 
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A typical room 3 x 3 needs about 1 kW. Thats about 110 w/sqm.

Read all the posts about UFH as it does have some disadvantages!

Tony

Tony is right there's a few disadvantages, but they are only a few.

If you've lived in a home with UFH you'd never want to go back to 19th centuary radiators.
 
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Thanks very much, it is a proper extension, one more question though- what does 100w m2 actually mean, heat wise, compared to a radiator? I'm generally cold so will this get warm enough for me to be in a tshirt? Or will I be in extra jumper territory?

It's the floor output; 1M2 will give an output of 100watts.

You have a large glazed area, so this should be given careful consideration for heat loss & solar gain. If you have employed the services of a Architect, they'd do a heat-loss calculation for you. In fact, depending on your Building Warrant requirements, it may well have been done.
HTH
 
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