Ready, steady… save!
You don’t need a chart to join in. Here are 2 ways to record your savings:
1. Cross it off
Pop a chart into your first post. Saved an amount? Cross it out! Read more »
£0.01 £0.02 £0.03
2. Write it down
Skip the chart and add updates to your first post. Read more »
“Another +£3 saved today. Go me!”
Use +£ before each new saving so it counts towards your total.
📨 Have you signed up to the Forum's new Email Digest yet? Get a selection of trending threads sent straight to your inbox daily, weekly or monthly!
Heat pump hot water cylinders
anon_ymous
Posts: 2,048
Forumite
So, most of these have a COP of 3.6 (theoretical)
Ie: At 35.4p/ kWh per unit, they theoretically they cost 9.83p/kWh vs 10p on gas. Or they don't technically but it's easy comparison and helps compare apples to apples somewhat
The heat batteries can be charged at 12p/KWh at night and that's not theoretical. That's just a normal tariff
My question is, could you "charge" these at night? So they're actually costing you a theoretical 3.3p/kWh instead?
If you can, that gives them a big leg up on heat batteries
Ie: At 35.4p/ kWh per unit, they theoretically they cost 9.83p/kWh vs 10p on gas. Or they don't technically but it's easy comparison and helps compare apples to apples somewhat
The heat batteries can be charged at 12p/KWh at night and that's not theoretical. That's just a normal tariff
My question is, could you "charge" these at night? So they're actually costing you a theoretical 3.3p/kWh instead?
If you can, that gives them a big leg up on heat batteries
0
Comments
-
The Seasonal (average) COP will depend on how hot you make the water. If you quote the COP you have to quote the water temperature also or it is a meaningless number.
Yes, of course you can charge them at night. Anything electrical has the potential to be operated at night on an Economy 7 tariff or similar. But depending on where the heat pump is situated the noise could potentially disturb you or your neighbours. You could probably avoid this with a little care but it's worth giving a bit of thought to.Reed2 -
Thanks. FWIW, I have an attic and they do not so that's something. My boiler is in my atticReed_Richards said:The Seasonal (average) COP will depend on how hot you make the water. If you quote the COP you have to quote the water temperature also or it is a meaningless number.
Yes, of course you can charge them at night. Anything electrical has the potential to be operated at night on an Economy 7 tariff or similar. But depending on where the heat pump is situated the noise could potentially disturb you or your neighbours. You could probably avoid this with a little care but it's worth giving a bit of thought to.
That does make a heat pump cylinder look substantially better then from a cost POV. The water temperature would probably be at 40-45C?ie: showering, washing dishes
And then obviously 60C periodically
But even if the COP was 1.3, that's still cheaper than gas (if you don't count the cost of the actual cylinder) given that 12/1.3 = 9.23
0
Confirm your email address to Create Threads and Reply
Categories
- All Categories
- 355.9K Banking & Borrowing
- 255K Reduce Debt & Boost Income
- 456.2K Spending & Discounts
- 248.4K Work, Benefits & Business
- 606.1K Mortgages, Homes & Bills
- 179.1K Life & Family
- 264K Travel & Transport
- 1.5M Hobbies & Leisure
- 16.2K Discuss & Feedback
- 37.7K Read-Only Boards