First year of ASHP power use

[Post and beam]

4th October marks the first full year of occupation of our new build. The heat pump has recorded 2650kWh for a cost of £703. This is taken straight from the Vaillant app and yes i know that some believe it to be potentially less than accurate. But ours is a very simple system so i am inclined to go with it unless i discover a reason not to. We have no gas supply so that is all of our heating and hot water.  Happy with this.

Now i need to try to get an accurate idea of what Octopus recorded for everything.

Edited 9 hours ago by Post and beam
Spelling

[JohnMo]

Usage is pretty similar to ours when were doing DHW also.  But not bad for heating and cooling.  Now you have that information maybe worth comparing other tariffs and see how they work out as I assume the £703 is based on a standard tariff and has no solar (battery?) input.

[SteamyTea]

25 minutes ago, Post and beam said:

The heat pump has recorded 2650kWh for a cost of £703

703[£] / 2650 [kWh] = 26.5p/kWh

 

Something does not seem right there.

[Post and beam]

1 hour ago, SteamyTea said:

Something does not seem right there.

Why?

1 hour ago, JohnMo said:

for heating and cooling

Heating & hot water. I cut the cooling fraction out.

[SteamyTea]

1 hour ago, Post and beam said:

Why

It suggests a CoP of 1.

Cost me about half that on E7, storage heaters and an immersion heater.

[marshian]

1 minute ago, SteamyTea said:

It suggests a CoP of 1.

Cost me about half that on E7, storage heaters and an immersion heater.

I think @Post and beam was declaring the electric consumption of the heat pump rather than the heat generated (which would work out as a cop of 1)

 

@Post and beam if you are pulling usage data out of Octopus it can be a bit flakey - I've reverted to the old consumption page because it doesn't have missing data as often as the current consumption data extract

[Post and beam]

OK guys i get what you mean. Apologies.

So, that 2650 kWh is what the Vaillant app records as energy consumed. For a generated 12119. so a SCOP of 4.56

[Post and beam]

As it happens our total electricity use since the board was made live is exactly 6100 kWh as of 2 hours ago. This includes the couple of months prior to us actually moving in full time. so there will be a little consumption not accounted for elsewhere. Small amount, i dont think it changes the figures enough to care.

[SteamyTea]

4 minutes ago, Post and beam said:

SCOP of 4.56

That's better.

[JohnMo]

40 minutes ago, Post and beam said:

generated 12119. so a SCOP of 4.56

CoP sounds good, but heat generated how does that compare to your design energy usage? If 12,000kWh is correct all good. But I thought your house was near Passivhaus standards, so maybe high depending on house size and hot water usage.

[marshian]

42 minutes ago, Post and beam said:

As it happens our total electricity use since the board was made live is exactly 6100 kWh as of 2 hours ago. This includes the couple of months prior to us actually moving in full time. so there will be a little consumption not accounted for elsewhere. Small amount, i dont think it changes the figures enough to care.

 

6100 - ASHP usage of 2650 is 3450 Electric used by other appliances so that's a little over the average but then so are we at around 3600 (2 people in 4 bed house with a reasonable level of tech/convenience)

 

The scop is good too!!! 

 

Edited 4 hours ago by marshian
typo

[ProDave]

If you  are looking for comparisons, My rolling 12 months usage for ASHP  is 1200kWh in heating mode and 700kWh for hot water.

 

That's electrical power into the heat pump.  Measured with a dual rate electricity meter (old dumb E7 electricity meter)

 

No idea of COP my heat pump has nothing to measure output power of even how to estimate it.