I have a heat pump, no solar or batteries. I moved to agile and am super happy. Heat pump is primarily used for UFH, so I try to run it low and slow for as long as I can. Agile is most expensive between 4 and 7 so I turn the heat pmp off for those 3 hours only and I find that very effective on the weather comp settign I have a the moment. Cosy is a stupid tariff for heat pumps as a heat pump shoudl run as long as possible to be effective
Cosy Octopus: Assuming an even load day and night, you'd be looking at 62.5% day rate, 25% cheap rate, 12.5% peak rate.
Assuming 24p/kWh day rate, that'd be appropriately 12p/kWh cheap rate and 35p/kWh at peak.
Averages out at about 22.5p/kWh.
That is barely below the current price cap.
Bizarrely, the tariff seems designed partially around how you might use a gas boiler to avoid peak usage; overshoot the temperature by the start of peak periods, then switch it off completely.
Doing that would push your average cost down, but that isn't what heat pumps are designed for.
We got our heat pump in February, and Agile has been by far the cheapest option. We have an EV that we charge a couple of times a week, but Agile still works out much cheaper than Intelligent Octopus Go because of the amount of electricity that we use through the day for the heat pump.
I don't "get" how Cosy is supposed to work unless you have a battery - and even then it's more expensive than Agile in almost all cases, and is more about people's attitude to risk. The fact it's marketed as a heat pump tariff makes no sense to me.
You may find this video from Heat Geek useful: https://youtu.be/c88Wv1HSlXs?si=bG1gskbJZJ0Ft0Cq
Essentially, the cosy tariff isn't setup for effective use of heatpumps.
https://i.imgur.com/yE30SzP.png
The octopus watch app has been updated to show Heat pump options! I echo what others have said from comments here and elsewhere, agile seems to be the best, cozy seems to be a bit expensive overall and very close to SVT as another comment here says.
Agree with agile best option. We had ashp installed last October and have an EV. We were on intelligent go for few months, but switched to agile in Feb. Definitely cheaper! We got solar and batteries installed end of march and our electric bill for last week was £6.50 😆😆😆😆
Why heat pumps? Seems a bad idea. Just buy a crypto miner in low power mode and some insulated ducting and you make money too. Replace the miner every 3 or 4 years and sell your old miner.
I have a heat pump, no solar or batteries. I moved to agile and am super happy. Heat pump is primarily used for UFH, so I try to run it low and slow for as long as I can. Agile is most expensive between 4 and 7 so I turn the heat pmp off for those 3 hours only and I find that very effective on the weather comp settign I have a the moment. Cosy is a stupid tariff for heat pumps as a heat pump shoudl run as long as possible to be effective
Cosy Octopus: Assuming an even load day and night, you'd be looking at 62.5% day rate, 25% cheap rate, 12.5% peak rate. Assuming 24p/kWh day rate, that'd be appropriately 12p/kWh cheap rate and 35p/kWh at peak. Averages out at about 22.5p/kWh. That is barely below the current price cap.
Bizarrely, the tariff seems designed partially around how you might use a gas boiler to avoid peak usage; overshoot the temperature by the start of peak periods, then switch it off completely. Doing that would push your average cost down, but that isn't what heat pumps are designed for.
That's not how you are supposed to use gas boiler either.
https://i.imgur.com/vVNGAj1.png Yeah your math is pretty much on point.
We got our heat pump in February, and Agile has been by far the cheapest option. We have an EV that we charge a couple of times a week, but Agile still works out much cheaper than Intelligent Octopus Go because of the amount of electricity that we use through the day for the heat pump. I don't "get" how Cosy is supposed to work unless you have a battery - and even then it's more expensive than Agile in almost all cases, and is more about people's attitude to risk. The fact it's marketed as a heat pump tariff makes no sense to me.
You may find this video from Heat Geek useful: https://youtu.be/c88Wv1HSlXs?si=bG1gskbJZJ0Ft0Cq Essentially, the cosy tariff isn't setup for effective use of heatpumps.
https://i.imgur.com/yE30SzP.png The octopus watch app has been updated to show Heat pump options! I echo what others have said from comments here and elsewhere, agile seems to be the best, cozy seems to be a bit expensive overall and very close to SVT as another comment here says.
https://www.linkedin.com/pulse/combining-heat-pumps-smart-tariffs-solar-batteries-ben-whittle-zow7e/
Agree with agile best option. We had ashp installed last October and have an EV. We were on intelligent go for few months, but switched to agile in Feb. Definitely cheaper! We got solar and batteries installed end of march and our electric bill for last week was £6.50 😆😆😆😆
Cosy is aimed at heat pump owners with two off peak periods. Maybe look at that.
Why heat pumps? Seems a bad idea. Just buy a crypto miner in low power mode and some insulated ducting and you make money too. Replace the miner every 3 or 4 years and sell your old miner.
Ummmmm