New to Heatpumps

Scot_39

Odd_CatFish said:

Vitor said:

A heat pump doesn’t need a special tariff and there’s no comparison site just for them. It’s simply another electrical load. The real question is how much of your usage falls into off-peak hours and whether your system can shift heating and hot-water production into those cheaper periods. Without actual consumption data your “£30 a month” saving is only a guess.

On export, 15p per kWh is not a universal rate. Each supplier sets its own SEG tariff and some pay much less. The important thing now is to learn how your system behaves: flow temperatures, off-peak usage, export rate and how much heating you can shift into cheaper hours. Once you have a week or two of real numbers, picking a tariff and getting the system tuned becomes far easier.

Thank Victor that is a very good  point.  Unit you have  some  real-time data it is all guess work.  I was basing my usage on what I used when I had 30 year old storage heaters 

With a sensible ASHP and use profile - you should hope to be way down on consumption - say a cop of 3 - is that factored into your £30 - or are you genuinely using same kWh import as NSH - so in reality the COP will drop to £10 (or less)

Alnat1

The cheapest way to run a heat pump when you have solar is with some battery storage. You fill up the battery in the cheap slots of whatever tariff you choose and run the ASHP and household load from it when electricity is more expensive. You can see my setup from my signature, average unit cost over the last 28 days is 14.09p. House is set to 20C 4am-9pm, 18C overnight. Hot water is heated in 10-12pm Cosy slot when house is cooling down.

Without a battery you will need to try and heat the house to a higher temperature in the cheap slots (+1C to what you really want?) and shift high use appliances to these hours too. When electricity is more expensive, set temperature -1C to what you really need. Heat hot water when the house doesn't need heating if possible, a heat pump can't do both at once.

I believe Octopus Cosy is the only tariff available with 3 cheap slots, without a battery (or only a small one like me) it can really make a difference to get those extra 2 discounted hours in the evening.

Odd_CatFish

Scot_39 said:

Odd_CatFish said:

Vitor said:

A heat pump doesn’t need a special tariff and there’s no comparison site just for them. It’s simply another electrical load. The real question is how much of your usage falls into off-peak hours and whether your system can shift heating and hot-water production into those cheaper periods. Without actual consumption data your “£30 a month” saving is only a guess.

On export, 15p per kWh is not a universal rate. Each supplier sets its own SEG tariff and some pay much less. The important thing now is to learn how your system behaves: flow temperatures, off-peak usage, export rate and how much heating you can shift into cheaper hours. Once you have a week or two of real numbers, picking a tariff and getting the system tuned becomes far easier.

Thank Victor that is a very good  point.  Unit you have  some  real-time data it is all guess work.  I was basing my usage on what I used when I had 30 year old storage heaters 

With a sensible ASHP and use profile - you should hope to be way down on consumption - say a cop of 3 - is that factored into your £30 - or are you genuinely using same kWh import as NSH - so in reality the COP will drop to £10 (or less)

No I was just using what electricity I used last year as a guide as I know it will be a LOT Cheaper, 🤞🤞it will be at least 50% cheaper. 

Odd_CatFish

Alnat1 said:

The cheapest way to run a heat pump when you have solar is with some battery storage. You fill up the battery in the cheap slots of whatever tariff you choose and run the ASHP and household load from it when electricity is more expensive. You can see my setup from my signature, average unit cost over the last 28 days is 14.09p. House is set to 20C 4am-9pm, 18C overnight. Hot water is heated in 10-12pm Cosy slot when house is cooling down.

Without a battery you will need to try and heat the house to a higher temperature in the cheap slots (+1C to what you really want?) and shift high use appliances to these hours too. When electricity is more expensive, set temperature -1C to what you really need. Heat hot water when the house doesn't need heating if possible, a heat pump can't do both at once.

I believe Octopus Cosy is the only tariff available with 3 cheap slots, without a battery (or only a small one like me) it can really make a difference to get those extra 2 discounted hours in the evening.

Hi Alnat, 
 

I haven't got a battery. Not sure if I can have as I'm mid-terrace and don't believe I can put the Battery in the Loft.but it is something I'll look it at a later date. 
Octopus Cosy is one of the tariffs I'm looking at but if you factor in the 3 hours (16:00-19:00) at Peak rate I wasn't sure if it would then make the  EDF Heatpump tariff cheaper  ??