RTS SHUTDOWN AND THTC

Yarrows

https://forums.moneysavingexpert.com/discussion/comment/82034568#Comment_82034568

Yes, it was OVO.

Ildhund

@Yarrows wrote:

… on my version of THTC, the separate rate for heating was much higher than E7's off-peak rate (and a bit higher than the E10 off-peak rate available from the same supplier) and, as with those tariffs, it was counteracted by a higher peak rate. 

… we first went to E10 [in] December and we paid somewhat less over that first winter than we had on THTC, but the downside was that we really missed the up to 12 hours heating when the weather called for it, and the E10 timings weren't great for our heating needs especially with our older storage heaters so we were cold in the peak periods

This real-world experience, coupled with your later information that the annual heating demand was 15000kWh, allows us to do a few rudimentary calculations. Assuming that some proportion of the 15000kWh goes towards the domestic hot water supply, you were perhaps using 45kWh a day on space heating via your storage heaters. That is an average constant draw of almost 2kW. So to achieve 45kWh delivered in 10 hours, there's a shortfall in capacity of 2.5kW - easily filled by inexpensive direct heaters to be run during the daytime offpeak hours after the storage heaters had run out of steam. A quick comparison of costs using readily-available tariff details shows that these 15000kWh would cost annually about £250 less on E10 than on THTC. This isn't counting the savings from doing high-power activities during daytime offpeak periods rather than at THTC's anytime (peak) rate.

But of course whittling down the 15000kWh to, say, 5000kWh by using a heat pump makes the most sense, especially when the HP delivers the comfort you were missing before. I wonder what @[Deleted User] has to say.

[Apologies as always if my sums are wrong. Corrections welcome …]

MWT

https://forums.moneysavingexpert.com/discussion/comment/82035486#Comment_82035486

But of course whittling down the 15000kWh to, say, 5000kWh by using a heat pump makes the most sense,

I love our heat-pump, but I'm always careful when suggesting it is the best solution to those currently on electric heating as it can be expensive to move to A2W and not always practical to go A2A, but the point remains worth investigating.