Fabric and ventilation heat loss calculator

[SBMS]

4 hours ago, JohnMo said:

You still have to careful your not just wasting £300, with sh!te in sh!te out. 

 

I would get UFH in, which I think is done, make provision for ducts for pipes and cables through wall. Seal them up until after air test. Get house air test done, get MVHR in and commissioned, then if going down MCS route go get the survey done. Without all that in place there is a good chance it will be treated as default values for ventilation heat loss.

 

Or just don't bother MCS at all, spend £2500 on a suitable sized heat pump, buy a 200L direct cylinder - install. Power cable and communication cable to outside unit and two pipes to UFH manifold. Then claim VAT back as it's a new house. Little over £3k in materials claim around £600 vat back, so £2400 plus a little labour.

Agreed, you need the input data (fabric data etc) to be correct - but the same is said for Jeremy's tool. From what I've seen the modelling software for MCS new versions is more accurate as it accounts for PSI values.  The newer MCS standard also allows specifically for an Air permeability input (the below is Heatpunk's):
 

 

There's a good guide that explains this: https://help.heatpunk.co.uk/books/heat-pump-task-and-system-performance/page/ventilation-calculations-in-heatpunk

[JohnMo]

30 minutes ago, SBMS said:

There's a good guide that explains

But it still takes no credit for MVHR so as pretty rubbish, for anything better than an air test score of 3, which then has MVHR.