The winter is now over (I hope!) so how did it all work out?
I have readings for the years 2012, 2013 and 2015 (2014 was building work and I didn't have it set up for taking readings).
2012
- Using existing 7 aluminium radiators - no under-floor heating or solar assist, heat pump only.
- Area heated approx. 120M2
Hours of use: 3377
Kw used: 6592
Electric 0.1644/KWh
Total cost: 1084.21 euros
Average daily cost: 7.704 euros
2013
- Using existing 7 aluminium radiators - no under-floor heating or solar assist, heat pump only.
- Area heated approx. 120M2
Hours of use: 3653
Kw used: 6653
Electric 0.192/KWh
Total cost: 1273.73 euros
Average daily cost: 8.366 euros
2015
- Using 3 existing aluminium radiators
- 50M2 under-floor in lounge
- 10M2 under-floor in bathroom
- 130M2 under-floor in new build
- Area heated approx. 250M2
- 3 solar hot water panels to support heat pump
- Change of plate heat exchanger to larger model
Hours of use: 4116
Kw used: 5129
Electric 0.156/KWh
Total cost: 800.64 euros
Average daily cost: 4.67 euros
They are, I think, impressive results this year. They show conclusively that under-floor heating supported by solar hot water panels can save serious amounts of money.
Also, before I connected the heat pump in 2012 I was using around 1300 litres of oil to heat the house just part of the day. The readings above are for 24h/day heating and at approximately 21C.
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