200w/2 or 150w/m2 - BIG Install?

[twista]

Hi,

Why would you not install a 200w/m2 system, but have a 150w/m2?
Even if the room is well insulated, the faster the room heats the better no?

On top of that question, If I wanted to have UHF for Dining, Lounge, Kitchen and conservatory - I'm looking at about 7kW if everything is on at the same time (which it wouldn't in practice) - SO therefore do I need another ring main downstairs just for the UHF?

For example an extra ring main with 4 fused spurs in each room to take the thermostat/UHF off of.

Thanks for the top answers,
Phil.

 

[Dan]

The cost of a 150 / 160 will be a little less, though if you have adequate insulation you can often get away with a 150 / 160 so why use that extra 40/50 per square meter if you can get away without it?

Personally, I'd have the 200 as it's a one-time thing. Though developers and the likes will always opt for the 160 systems as they cost a bit less.

As for the ring-main, it depends on what's in each room already I guess. Though I'll let the professionals reply on that one.

 

[pjrich]

Hi,

Why would you not install a 200w/m2 system, but have a 150w/m2?
Even if the room is well insulated, the faster the room heats the better no?

On top of that question, If I wanted to have UHF for Dining, Lounge, Kitchen and conservatory - I'm looking at about 7kW if everything is on at the same time (which it wouldn't in practice) - SO therefore do I need another ring main downstairs just for the UHF?

For example an extra ring main with 4 fused spurs in each room to take the thermostat/UHF off of.

Thanks for the top answers,
Phil.

Underfloor heating is usually sized to suit the heat loss of a room + 20-30%, that is why generally 160W is used for normal rooms where you can achieve 85% floor coverage with the heating. 200W/m2 is normally used in high heat loss areas, such as conservatories. Typically heat loss in a conseratory works out to be 160-170W/m2.

If you can't acheive 85% coverage in an normal internal room, then you would consider using 200W/m2 but only if the flooring is tiles.

I would agree with the principle of installing a dedicated for the heating when you have 4 areas to heat.

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