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14-07-2019, 18:12   #1
 
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A3 rated new-build - gas, electric & solar

Afternoon all, you'll have to forgive me, I know nothing about these things...

I know all new build houses have to be A3 rated these days, at a minimum. I was looking at one the other day, where the heating is a combi gas boiier along with an electric fire in the living room (no chimney) - there are also 5 solar panels on the roof - presumably for water, but I'm not sure... They could be PV either. There's also no tank in the hot-press. It's an ~100 sqm 3 bedroom semi-d.

I was under the impression from looking at other new builds that heat pumps were required to achieve the A3 rating? How is it possible with gas / electric / solar?
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14-07-2019, 18:29   #2
kceire
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A2 from November.

Very easy to hit A3 to be honest even with gas, solar and electric.
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14-07-2019, 18:37   #3
 
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Originally Posted by kceire View Post
A2 from November.

Very easy to hit A3 to be honest even with gas, solar and electric.
Just make sure the insulation is to spec and the house is sealed properly? I noticed the windows were double rather than triple glazed too. How hard would it be to make it better still?
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14-07-2019, 18:49   #4
kceire
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Just make sure the insulation is to spec and the house is sealed properly? I noticed the windows were double rather than triple glazed too. How hard would it be to make it better still?
To make it better your talking about reducing your air tightness level to 5 or better instead of the minimum 7.

Up the insulation. Orientation of windows etc
More efficient space heating and ventilation exchange maybe.
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14-07-2019, 20:57   #5
sydthebeat
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Quote:
Originally Posted by Phileas Frog View Post
Afternoon all, you'll have to forgive me, I know nothing about these things...

I know all new build houses have to be A3 rated these days, at a minimum. I was looking at one the other day, where the heating is a combi gas boiier along with an electric fire in the living room (no chimney) - there are also 5 solar panels on the roof - presumably for water, but I'm not sure... They could be PV either. There's also no tank in the hot-press. It's an ~100 sqm 3 bedroom semi-d.

I was under the impression from looking at other new builds that heat pumps were required to achieve the A3 rating? How is it possible with gas / electric / solar?
if its a combi gas boiler, then the solar panels are most definitely PV.

and there are many ways to get to A3 level.....

Heat Pumps are popular with one off builds as they provide 3 required energy sources in one system ie space, water and renewables.
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