We have just had our first 12 months of using an Air to Water Heat pump in place of the previous heating system which was an oil fired Combi Boiler.
Although the Oil fired boiler was only 12 years old it kept tripping out so we would often wake up to no heating and it would also trip out during the day. As it was a combi boiler when reset it would first of all, as is normal, heat the domestic hot water before the radiators, so it would be ages after we got up before the house was warm.
For our three bed bungalow the annual costs on oil were around 1500 euros - at 1 euro per litre ( as it was in 2013/2014) plus the cost of the annual service and several call outs by the engineer.
I took the decision to convert to an Air to Water heat pump for the heating - connected to the existing radiators, and to use a Cumulus for the domestic hot water. In order to gain from the "Cedit Impo" benefit offered we had to do an additional environmentally friendly thing so we opted for having the roof void insulated with a thick layer of loose fibrous material.
We also took the opportunity to add 2 extra radiators - one in the utility room for helping dry clothes and one in my office which is in the conservatory, making 10 radiators total.
The installer estimated that our annual heating costs - as reflected in our electricity bills, would be around 600 euros - a significant saving. The actual costs, as proven by comparing actual electricity bills is only 447 euros for the full year!!
This is far better than expected and we have run the heating from 6am to 11pm every day from October to March April - as regulated by the thermostat which can be moved from room to room and overridden as you wish.
It`s only fair to point out that the water temperature in the radiators is lower than with an oil or gas boiler but because the heating is on 17 hours a day the house is now much more comfortable than before. We have also used half the amount of wood because the house has been warmer and it has not been necessary to light the wood burner as often.
The lower water temperature makes this type of system ideally suited for underfloor heating if anyone is thinking of installing that type of heating. I`m sure then the savings would be even greater.
The overall cost of the installation was 12,000 euros but payback will be faster that expected and the comfort level achieved well above what we hoped for.
My wife (do all ladies feel the cold more than men?) - is delighted with the system - Happy Wife Happy Life I say!