Insulation, Heating System, Geo-thermal.

darrenss

Starting a new build soon, 240m2 few questions.

Pumped insulation or standard 50mm sheets of insulation in external walls?

Under-floor heating systems?
Air-to-water or geo-thermal ground system?

What are avearage costs, advantages and disadvantages.

Condenser

darrenss wrote: »

Starting a new build soon, 240m2 few questions.

Pumped insulation or standard 50mm sheets of insulation in external walls?

Under-floor heating systems?
Air-to-water or geo-thermal ground system?

What are avearage costs, advantages and disadvantages.

If possible increase your cavity to 6" and pump it. The return is far superior to kingspan/xtratherm panels. The sheets are rarely fitted correctly (you're relying on a blocklayer to fit them) and unless they are perfect your insulation levels drops by quite a bit. They also can move over time, especially if they get wet.

If you have the ground, go for geothermal. You're COP across the year will be much higher and bills more predictable year in year out. Air to water is more susceptible to the weather and efficiency will drop as the temperature drops.

When installing a heatpump you should insure your UFH is designed to operate at as low a temp as possible. The lower the temp required, the more efficient the heatpump will be.

MicktheMan

darrenss wrote: »

Starting a new build soon, 240m2 few questions.

Pumped insulation or standard 50mm sheets of insulation in external walls?

Under-floor heating systems?
Air-to-water or geo-thermal ground system?

What are avearage costs, advantages and disadvantages.

Get the fabric right first (insulation, thermal bridging, airtightness & ventilation detail) and you heating requirements will become very simple.
Hire an experienced professional sooner rather than later.

fclauson

Use the BER and PHPP excel sheets to model your make up - this can then help you drive the most cost efficient build out

Francis