Air Source Heat Pumps

albyota

the signals do seem to point towards a reduction in CO2 emmissions caused from burning fossil fuels, and yes we all know electricity power stations are predominantly still fossil fueled, but to change from dirty to clean electricity, funding is required and whether government tax us all for it or whether they tax the energy providers, fuel prices will probably increase and we will all end up paying higher energy prices.

stevehead

Don't know if this has been clocked by forum members:
http://www.lowcarbonbuildings.org.uk/micro/air/

ASHP is now generally rated as delivering 3 -4 units of heat for every 1 unit of electricity consumed. It also offers a saving of £300 per annum over using Gas.

It's now official! Running ASHP is a lot cheaper than heating by any other method - period!

mech_2

stevehead wrote: »

Don't know if this has been clocked by forum members:
http://www.lowcarbonbuildings.org.uk/micro/air/

ASHP is now generally rated as delivering 3 -4 units of heat for every 1 unit of electricity consumed. It also offers a saving of £300 per annum over using Gas.

It's now official! Running ASHP is a lot cheaper than heating by any other method - period!

It would be nice to know how those figures were arrived at as I can't make them agree with each other at all.

albyota

evening mech, how do you mean?

albyota

We have been in touch with various ASHP suppliers to get a definitive answer, pointing them in the direction of DECC, EST, LCBP and MCS, some out of date info, and/or contradicting calculations/savings charts.

albyota

I used to have oil fired central heating which was used for heating and DHW in the winter, and in the summer I used the electric Immersion heater, now I have the ASHP boiler it is used for DHW in the summer and does the heating in the winter, very efficient and this has saved me around £700 since installed last Oct. so the £580 saving on oil they are publishing I can well believe.

mech_2

albyota wrote: »

I used to have oil fired central heating which was used for heating and DHW in the winter, and in the summer I used the electric Immersion heater, now I have the ASHP boiler it is used for DHW in the summer and does the heating in the winter, very efficient and this has saved me around £700 since installed last Oct. so the £580 saving on oil they are publishing I can well believe.

I haven't looked at the oil figures as I don't know the prices for oil. I was trying to make the figures for gas and electricity make sense. But using standard CO2 conversion factors I cannot recreate the pattern of cash and CO2 savings with any sane numbers. Even just the electricity savings don't ring true. 6 tonnes of CO2 would be roughly 11173 kWh of electricity if I'm not mistaken. To save £870 that would have to be around 7.79p/kWh. Who pays as little as that?

I am unable to come up with a set of assumptions about gas prices, gas boiler efficiency, gas usage etc that can agree with the figures in that table. Even unrealistic figures. Get the prices and kWh to tally and the CO2 savings are wrong and vice versa.

albyota

OK I have had my Air to Water Air Source Heat Pump fitted 11 months now and I thought it would be interesting to see what it has cost to run.
The system heats a 4-bed house, with a family of 5 (3 Teenagers) mostly all at work or school, the system feeds under floor heating on both floors, the system also heats the water at a temperature more than hot enough for all our needs. One thing to remember is we don’t have any other form of heating fuel. We are now all electric. (Oil boiler ripped out). To show an average consumption I have included Aug 08 to Aug 09 use of 10,420 kWh units which at my current tariff equates to circ. £957.00. And Sept 08 to Sept 09 use of 10,221 kWh units = c £939.00

From January 1st 09 to present (October 8th 09) we have used 6865 kWh units which at my current tariff equates to c £617.00 which includes the coldest winter for ten years (lowest, minus 8 and many sub zero days.) estimated use for the next 3 months (year end) is Oct 600 + Nov 800 + Dec1000 so potentially 2400 added to 6865 = 9265…. so an annual bill of £834.00 or thereabouts...thats heating, hot water, cooking, washing machine, TV's, comps, dishwasher etc.....everything all year
My direct debit stands at £75/ month at the moment, which is enough to cover a £900 / yr bill.

russt2000

hi , been reading the thread really interesting,

my problem really limited funds ,old solid wall house 1903, very draughty , no gas or oil all electric and only a few old storage heaters, ancient double glazed windows doors, just to get it warm at all we are using ad hoc portable heaters all over and have a horrendous monthley spend , {150} .

may have a bit of spare money coming soon and wondered on the the best way to utilise it efficiently?

3 bed semi, wooden floors , useless uninsulated dry lined walls {the whole house} cant afford to strip off and replace. , have insulated loft to correct depth.

may have enough for coming for either allwindows and doors to be replaced , or to have some full central heating put in , like the sound of these ashp's or some all electric modern boiler?

no idea of install costs , would need about 9 radiators and hot water.

any advice or tips much appreciated

russ

paceinternet

albyota wrote: »

OK I have had my Air to Water Air Source Heat Pump fitted 11 months now and I thought it would be interesting to see what it has cost to run.
The system heats a 4-bed house, with a family of 5 (3 Teenagers) mostly all at work or school, the system feeds under floor heating on both floors, the system also heats the water at a temperature more than hot enough for all our needs. One thing to remember is we don’t have any other form of heating fuel. We are now all electric. (Oil boiler ripped out). To show an average consumption I have included Aug 08 to Aug 09 use of 10,420 kWh units which at my current tariff equates to circ. £957.00. And Sept 08 to Sept 09 use of 10,221 kWh units = c £939.00

From January 1st 09 to present (October 8th 09) we have used 6865 kWh units which at my current tariff equates to c £617.00 which includes the coldest winter for ten years (lowest, minus 8 and many sub zero days.) estimated use for the next 3 months (year end) is Oct 600 + Nov 800 + Dec1000 so potentially 2400 added to 6865 = 9265…. so an annual bill of £834.00 or thereabouts...thats heating, hot water, cooking, washing machine, TV's, comps, dishwasher etc.....everything all year
My direct debit stands at £75/ month at the moment, which is enough to cover a £900 / yr bill.

Very useful numbers for visitors that only ever hear sales type hype. Any idea how much oil and electricity you were using before the heat pump installation?

Does your system have some auxilliary heat switched in if the heat pump cannot maintain the set temperatures?
If so, do you know how much that is being used and costs?
Does the heat pump make domestic hot water at 60 all the time, or do you have a daily/weekly "thermal disinfection" routine?
Thanks