Using the reported consumption figures since it was installed at the end of August, I've been comparing my HP's estimated running cost with what my old gas boiler would have cost to produce the same amount of heat. So far it's still cheaper each day than if we'd stayed on gas, and significantly cheaper overall (yesterday would have cost me £16.50 for example). I'm not sure if it will remain cheaper on each individual day for the duration of winter, but I'm fairly certain it will net out cheaper over the course of the year.

A fair chunk of that is down to the battery + TOU tariff though, which makes for a slightly unfair comparison as it doesn't account for my normal electricity use also being more expensive during the day. Having said that, I also have solar panels, but I have ignored them for the above comparison, so maybe it balances out. One day I'll do this properly...

Thermostat set at 20.

Also have 4.2 PV array so washing machines/dishwashers etc are mix and match on daytime or overnight use obviously depending on amount of sunshine available at this time of year in Lincolnshire.

Currently on Scottish power EV tariff so 6p kw overnight 31p every other time until May or unless a better tarrif comes along 🤞. On RHI and awaiting for Scottish power to pull there finger out for an awaited SEG so costs are/should be offset versus summer use.

Powering X2  10kw Grant Aerona installed this January for approx 350sqm, and still experimenting with water Temps and hive thermostat and water heating. I've just realised 🤦🏻‍♂️ why I was getting spikes in electricity due to hot water being timed right until the 6p cut off without thinking that the heating is off thus spiking just as the 32p/kw starts after 5am thus the thermostat has to catch up I guess. With this in mind hoping for a lesser usage next week. Also turning off the trv in unused rooms but not sure if latency would drag my heat into there?

Looking at batteries - would probably invest in a Tesla Powerwall as these seem to be the only ones that would deliver domestic electricity in a power cut? And especially as my partner is also getting an EV next year. It looks like there will be further rolling out of V2H but pod point won't support this and not sure if would be happy with car battery degradation.

If it is safe probably would invest in more PV and a compatible EV charger instead.

Might also look at installing a diverter in time for summer to use excess PV to charge EV/heat water cylinder.

I save was 50kWh.

Sorry, I can't interpret that. 

Sorry should have said: Yesterday was 50kWh. 

I save was 50kWh.

Sorry, I can't interpret that. 

usage was 80kWh for the day 

Yesterday we decided it was a bit too warm so moved the stat back downstairs and set to 18.5 instead of 18. 

I save was 50kWh. On a colder day. 

Just shows how much difference a small change can made. 

im hoping not to go over 50kWh per day over the next week or so. We shall see. Maybe ambitious…

If I think of what my my wife and I would have been paying 5 days a week in petrol and diesel respectively on our former commutes then we're in pocket even having the heating on 24/7 while we're both mostly WFH.

Avg 7C Day

Consumption ~14kWh

Avg 4C Day

Consumption ~ 17kWh

These numbers are approx 2kWh high as they include DHW production.

Room Temp 20C however we have used the log burner on some evenings and reduced the heat pump use.