best option for new house

[steady]

just planning a new build 250m highly insulated , what would be the best option to run it ?

if solar pv  what size 3ph or single ph ? battery storage ?

can we do gas boiler now on a new build ?

basically what would be the ultimate best option ?

[Andehh]

ASHP, UFH, 4kw solar array for a minimum.  Don't bother with gas.

 

Wire for a battery, but the economics don't make sense to assume it in IMO, just have it as an option further down the line.

 

Yes for 3PH, to enable multiple vehicle charging (ie 2 in garage and one outside for visitors).

 

Invest in insulation and air tightness to pragmatic degrees, there is a law of diminishing returns. Spend the rest on hard wiring and future proofing options.

[JohnMo]

You can do gas.

We started gas and 3kW of PV. Gas boilers are difficult if you have a low energy requirement house, as they are just too big.

 

Now we have 7+kW PV, battery and ASHP. March is still heating season for us, but electric import yesterday was £1.60, today looks to be 65p (best cost days so far this year). Heating run overnight on both nights. That is only possible because we have the battery and can run E7, cost effectively.

 

With the good and bad days of the winter, the battery and E7 have been £386 cheaper than running the house on just normal rate electric and a similar amount cheaper than gas and electric last year. Looking to make even greater savings during the summer. (I don't get paid for exported electric)

[SteamyTea]

As above.

Regardless of what people say and think, we are going 'all electric', it makes long term sense for many reasons.

 

 

[pudding]

ASHP, and go big on solar and battery. 10kWp+, 20kWh+ battery, do it at this stage as cheaper. Then you can take full advantage of cheaper ToU tariffs and run majority if not all of the year on cheap rates/free PV electricity.

[JohnMo]

1 hour ago, steady said:

what would be the ultimate best option ?

22 minutes ago, pudding said:

full advantage of cheaper ToU tariffs

To get most advantage of ToU tariff you really need UFH and use as a storage heater. So a thick screed is good 100mm +/-.  It takes a long time to heat and cool down.

[pudding]

10 minutes ago, JohnMo said:

To get most advantage of ToU tariff you really need UFH and use as a storage heater. So a thick screed is good 100mm +/-.  It takes a long time to heat and cool down.

Certainly UFH to get best efficient use of the ASHP, but not necessarily a thick screed? As it's a new build, lots of insulation and good air tightness and it'll retain the heat without the need for the 'storage heater' of the thick slab? Of course it won't do any harm though.

Edited March 18 by pudding

[Adrian Walker]

2 hours ago, JohnMo said:

To get most advantage of ToU tariff you really need UFH and use as a storage heater. So a thick screed is good 100mm +/-.  It takes a long time to heat and cool down.

If you haven't built yet then consider an insulated slab, so no need for a screed.