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14-12-2012, 12:21 AM #2
Re: feedback on Daikin altherma HT please
We replaced our old oil boiler in July 2012 with a Daikin HT. I did a lot of comparisons and had shortlisted the HT and an ECODAN LT. At first I was going for the LT but once I had an accurate comparison I realised I would need very large increases in the radiators so I went with the HT. We have a victorian cottage with solid walls. I increased the loft insulation and fitted double galzing throughout at the same time. We have an open fire downstairs for colder evenings but otherwise the 14KW HT provides all the heating and hot water and is coping well, even over this last week where the average temperature has been zeroC.
In answer to your questions:-
1) There is a significant standby use. The Daikin calculations ignore it which is annoying. There is a continual load of 200W when it is doing nothing - 2.4kWh a day. The hot water in summer is another 3.5 - 4 units per day, though there are only two of us.
2) No buffer tank. We have the Daikin storage tank which fits on top of the indoor unit and looks quite neat next to our large fridge/freezer. We had no changes to the rads.
3) That is a question I spent a long time thinking about. In the end I calculated that the LT would spend too much of its time working at 45 rather than 35 and so the COP for the two systems would be comparable. At the moment with outside temperatures below zero the radiators are running at 70C and the house is nice and warm.
4) I don't think the rules for RHI are set yet but we were successful in getting the full RHPP grant and I believe that means we are eligible for RHI. Based on the performance so far I think our electricity bill will be about the same or slightly less than our previous oil + electricity bill. I am happy with that, I never really believed that there would be significant savings, I'm just glad it has worked out no more expensive. The supply and installation was around £12K, but I needed a new oil boiler, tank and a new flue which would have been approaching that amount.
5) I'm not sure about a deaerator, but they might have fitted one. There is a magnetic particle trap which is deemed essential