Central heat design

[Selfbuiler3]

Hello, This is my first post.

I'm building a new house. A self build project.
House is undergoing the first plumbing and electrical fix.

Does anyone know of a website/software that can calculate the Kw (kilowatts) of heating the house needs?.

I have found a site that has a online form that askes some questions and gives me Kw off 22, this matches up with what my boiler/solar provider says.

Just the website questions seam a bit approximate and don't (for example)ask me how much external glass there is and seams to assume the ground floor and the first floor are the same foot print etc.

Just need to find a source that is more detailed in asking and collecting the relevant data such as build materials, location, insulation of the dwelling etc.

I be grateful for any relevant feed back.

Thanks, Dave Jones (Anglesey)

 

[D_Hailsham]

As it's a new house it will, I trust, comply with current building regulations, i.e be well insulated. In that case, unless the house is very large or you are installing a combi (instant hot water) boiler, 22kW is probably much too big.

Use the Whole House Boiler Size Calculator to find out the recommended boiler size.

You say that the two floors are different sizes, presumably the lower floor is the larger! In that case do the calculation in two stages, with the single storey only part as a semi-d attached to the main house. Don't forget that you will not need to allow 2kW for hot water in the extension.

Example:

Main House as detached = 12kW inc 2kW water
Main House as semi-det = 10kW, inc 2kW water

Average (i.e 50% semi) = 11kW inc 2kW water

Extension as sem-det = 3kW, exc water.

Total requirement = 14kW, inc 2kW water.

The calculator makes assumptions about window areas, but you can always put in the correct figures.