Not sure where to start

[Luckylad]

Hello

We bought our plot with planning already passed. We need an ashp because we can't get mains gas. I've never had one before so don't have a clue what to look out for, when getting quotes.

Any advice would be appreciated!

 

[ProDave]

You start by detailing the design of the construction method for the house, working out how much and what type of insulation you are using, U values of windows and doors etc.  From that you can work out the worst case heating input requirement and then size your heat pump to match.

 

e.g in my case when it's -10 outside and +20 inside I will need a little over 2Kw of heat input so I have bought a 5KW ASHP which will heat the house via under floor heating.  Others on here have houses with an even lower heat requirement.

 

JSHarris has made a spreadsheet which you can download from here http://www.mayfly.eu/wp-content/uploads/2017/01/Fabric-and-ventilation-heat-loss-calculator-Master.xls

Enter the value for your own house and see what heat demand it gives you.

[Luckylad]

Thanks,That looks very helpful .

I'll have a proper look when I get home.