I found that this company were quite reasonable, and happened to have an installer in my area (north west). They're based in the north, and supply the Roth brand of UFH equipment. No affilliation apart from buying from them.
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Moved into new gaff around 10 weeks ago, and as others have said, not a whole lot of need for heating to be on full tilt yet. But as for the performance of my wood pellet boiler and UFH system, have to say that I have no complaints as of yet. Have it on for a couple of hours everyday, just to keep her ticking over, and its getting along just grand. Got it turned down from a 25 KW to an 16 or 18 KW output after installation, and it is using pellets at a rate that does not alarm me at all. Had my first look into the pellet storage unit that I knocked together, and there's plenty in her yet. No actual quantification has begun yet, as I'm too busy taking it easy after getting the gaff finished.
Got the Powertech chap to install my UFH downstairs, did it myself upstairs, pretty straightforward, and everywhere is cosy when the heating is on.
Have thought about the solar panel option and am going to put it off for a while, as if my WP boiler is on even for a wee while, there is loads of hot water, got a 300L SS dual coil cylinder, with the boiler hooked up to both coils (plumber recommended to do this if I was going to be leaving the solar panels for a while as the HW from the boiler goes through the tank twice essentially).
Have never been convinced about the whole heat pump/geothermal option. Looks and sounds good, but appears far too complicated, and in my humble opinion requires too high an initial capital investment. Thats apart from the fact that according to anecdotal evidence they are being reconsidered in that shangri la of sustainability and sense, Sweden, and the recent decision to reduce the grant associated with them as they are not as effective in reducing ones carbon footprint.
I mean one has to drill the hole, line the hole, put some equipment in the hole, fill this with an appropriate liquid (which may or may not be potentially damaging to the environment), pump this through a heat exchange unit, nearly constantly if I'm not mistaken, or at least for exteded periods of time, and hey presto, free energy?!
Seems to me like theres a lot of things that can break down. I'm far happier with a system that burns timber pellets, heats water in the same unit and pumps it through the house, less room for stuff to go wrong, and therefore less maintenance.
What I think is really daft about a lot of the geothermal systems is that you can conect them to the internet, to allow for remote access and control of the system, as well as 'troubleshooting' by the parent company if required. If you ask me, anything that has the capacity to be accessed by its parent company so they can fix it from Austria or Shanghai or where ever they might be was designed to break down!