Cost of a central heating / hot water pump

[Monkmonk]

Roughly how much would it cost to run a central heating and hot water pump for 16 hours?

[ChuckFickens]

Impossible to answer. just for a start nobody knows if you are trying to heat a one bedroom terrace house with decent insulation or a 20 bedroom mansion with no insulation.

[Monkmonk]

The heating and hot water switched off but the pump remained running. I know this should not happen but I am trying to find out how much it has cost me when it did happen.
The house has 5 bedrooms and is detached but that would not seem to make a difference given that only the pump is running.

[douglas9401]

Not much then (until the pump seizes up).

[Monkmonk]

Not much is true but would 32p for 16 hours be about right or would it cost more (or less)?

[ChuckFickens]

Look on the pump and see if it has a wattage value on it, if it has then you can work out the cost from that. (it would also help to know what you pay per unit if you want an accurate guesstimate)

[Monkmonk]

There is no wattage indicated. I only want an approximate answer from someone who has more idea than I do. Thanks.

[ChuckFickens]

assuming the pump is drawing about 100wats and your cost per unit is about 12p then 16 hours would cost 19.2pence

Though as you can see the values it's worked on are assumptions. to get an accurate figure the pumps rating and the cost per unit of electricity is required.

[Monkmonk]

Thank you very much, CF.
This was a problem for more than 18 months and so would have added about £100 to my heating bills.

[terence7556]

monk certain boilers like combis have pump overrun to dissipate the heat in the system and save wear /tear on the heat exchanger.untill the water has cooled down the pump will keep circulating the water