Best electric tariff now that OVO are ending the Heat Pump Plus in February 2026

[martian]

Been using OVO energy's cheaper 24 hour Heat Pump Plus tariff for a while, but just been told they are stopping this great tariff from Feb 2026. Other energy companies seem to offer cheaper tariffs targeted at certain times of the day, which as I understand negates a bit of the reason to have an ASHP in the winter, where I've been advised to leave it on constantly. Just wondered what tariffs people are using as don't really want to fiddle with having the ASHP not working when a tariff is higher.

Edited 17 hours ago by martian

[PhilT]

I've been using Octopus Cosy since they introduced 3 cheap rate windows. As far as I know it's the only one which "allows" you to have the fixed outgoing 15p/kWh for your PVs (correct me if I'm wrong I haven't checked recently). My Cosy rates went up by 10% from November because Octopus were losing money on it. My average variable cost before VAT for November was 18.5p/kWh. I have radiators and load shifting is minimal.

 

low/std/high variable rates are p/kWh    13.38    27.29    40.93

 

Edited 13 hours ago by PhilT

[DamonHD]

On my system am I pushing the weather comp curve down a few degrees (ie applying a setback to flow temperature, not room temperature) during peak:

 

https://www.earth.org.uk/heat-pump-16WW-control.html#current

 

I am actually on a flat tariff, but I did think about how I might make this work saving cash and carbon with Cosy:

 

https://www.earth.org.uk/heat-pump-16WW-control.html#Cosy

 

For our old gas combi I did indeed have the space heating entirely off for 4pm to 7pm.

[JohnMo]

34 minutes ago, DamonHD said:

On my system am I pushing the weather comp curve down a few degrees (ie applying a setback to flow temperature, not room temperature) during peak

I've started to do something similar. Found down to about 5 degs normal WC is just fine. But once I get into defrost mode, battery takes a bit of a pounding, especially with a couple of days sub-zero. So set the WC curve to stop at 5 degs, my old UFH controller has an outside temperature reference.  So use it as a cheap rate boost controller, so when its 5 degs and below outside and below 20.5 inside, it activates a second set point for the ASHP and allows a higher boost flow temp, for cosy cheap slots. Rest of the time the ASHP ticks away at a low flow temp. Use the same amount of energy, get similar CoP, but moves the majority of the energy usage to the cheaper time slots.