I bought a Heat Pump

Verdigris

If you're applying for RHI (admittedly too late now) you want your EPC assessor to assume the worst for what they can't see and to generally make your house look as bad as possible.  My EPC heating and HW requirements, which determine how much RHI I get, are way more than those on my MCS certification - and by way more I mean 45%

Yes, that was the plan, originally, but Covid conveyancing delays, unforseen (almost in the you-couldn't make it up category) delays and finally having to have a series of emergency eye operations, have pretty much put the kybosh on getting installed and commissioned by April.

shinytop

Verdigris said:

If you're applying for RHI (admittedly too late now) you want your EPC assessor to assume the worst for what they can't see and to generally make your house look as bad as possible.  My EPC heating and HW requirements, which determine how much RHI I get, are way more than those on my MCS certification - and by way more I mean 45%

Yes, that was the plan, originally, but Covid conveyancing delays, unforseen (almost in the you-couldn't make it up category) delays and finally having to have a series of emergency eye operations, have pretty much put the kybosh on getting installed and commissioned by April.

That's a shame but hopefully the £5k grant will be available and at least you don'rt have pay up front.

Verdigris

That's a shame but hopefully the £5k grant will be available and at least you don'rt have pay up front.

In some way the £5k is more useful. It leaves cash to go towards PV, batteries etc. Also, if I'd started when I'd originally anticipated I don't think the R290 filled ASHPs were available (I certainly wasn't aware of them, then), so I should save a bit by possibly being able to go down a size of pump and having lower running costs.

ccbrowning

I have a new build with a GSHP and solar PV and it has a B (90). Not even possible for me to get to A (92) due to how it rates the heating and hot water system. -one- recommendation:

shinytop

ccbrowning said:

I have a new build with a GSHP and solar PV and it has a B (90). Not even possible for me to get to A (92) due to how it rates the heating and hot water system. -one- recommendation:

£5k for 1 point.  Surely you'd save more than £71?

Cardew

shinytop said:

ccbrowning said:

I have a new build with a GSHP and solar PV and it has a B (90). Not even possible for me to get to A (92) due to how it rates the heating and hot water system. -one- recommendation:

£5k for 1 point.  Surely you'd save more than £71?

Some government sponsored tests showed that solar water heating systems* produced 800 to1100kWh pa - most in the summer.

With gas at 4p/kWh the savings were around £40 a year. Should you heat your tank on a non-E7 tariff around £140.

With electricity post April at 28p/kWh with a GSHP with a COP between 3 and 4 we are talking of costs of 7p to 9p/kWh. You also have to factor in the costs of running the pump and electronics @28p/kWh

* This was on a small system but with larger systems it produces more hot water in the summer than most people can use.

shinytop

Cardew said:

shinytop said:

ccbrowning said:

I have a new build with a GSHP and solar PV and it has a B (90). Not even possible for me to get to A (92) due to how it rates the heating and hot water system. -one- recommendation:

£5k for 1 point.  Surely you'd save more than £71?

Some government sponsored tests showed that solar water heating systems* produced 800 to1100kWh pa - most in the summer.

With gas at 4p/kWh the savings were around £40 a year. Should you heat your tank on a non-E7 tariff around £140.

With electricity post April at 28p/kWh with a GSHP with a COP between 3 and 4 we are talking of costs of 7p to 9p/kWh. You also have to factor in the costs of running the pump and electronics @28p/kWh

* This was on a small system but with larger systems it produces more hot water in the summer than most people can use.

Hmm, I was going to look into this but probably won't bother.  £100 a year or so doesn't really make it worth while.  

Verdigris

I'd put PV, rather than thermal, on any spare roof space, personally. Combined with a battery it's much more adaptable.

JKenH

Verdigris said:

I'd put PV, rather than thermal, on any spare roof space, personally. Combined with a battery it's much more adaptable.

Maybe consider PV plus diverter (iBoost, Eddi, etc). 

I posted my experience of using an IBoost  yesterday on the IBoost thread.

So far it has saved 4939 kWh, or around 140kWh on average per month, close on 1700kWh per year. If I assume that’s displacing Octopus Go Faster cheap rate electricity, it works out at £93.50 pa. For the first couple of years I was on an E7 tariff so was saving around £150/year. If it carries on working then in March, when the Go Faster rate increases to 8.25p, the saving will be around £140/year. Before I got the ASHPs I used to save more in winter.

If you heat your water by electricity and are displacing full price electricity at the latest rates (say 25p/kWh) you could save £400 per year with my usage. 

ccbrowning

Verdigris said:

I'd put PV, rather than thermal, on any spare roof space, personally. Combined with a battery it's much more adaptable.

Yeah I’ll just add more PV. Already have immersion tank anyway.