Discuss Nibe F2015 Air Sourced Heat Pump... Chances of selling second hand? in the Renewable Energy area at PlumbersForums.net

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Our biggest problem was exactly what you have said, plumbers not knowing what they were doing from the main contractor down to their two subcontractors but the actual pipe work isn't bad at all that is if you forgive them for installing the two houses with the same pipe work they bent for one!!! The sub contractor that professed to be heat pump engineers made a fortune installing this sort of technology to the council, a fortune.
So anyway we ended up, passed by our ex council's building control officer, with the system plumbed back to front, our tundish is around the back of the tank as is one of the immersion heaters, which if ever needs replacing will have to be done by a midget contortionist trained as a plumber, we have been told that correcting the plumbers work would be as costly as installing the system.
But with the house now properly insulated and drafts kept to the minimum the system now works well and brings the house up to 20 degrees quite fast.
 
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PROPERLY designed and installed systems cause no problems - we have loads of more than satisfied customers. We design in Worcestershire for -5°C outdoors and appropriate flow temperatures depending upon emitter type and design. When sized correctly, radiators can run at 45°C flow - we do it all the time with no problems. We have heat pumps that can happily go down to -20° at full outuput.

Not only that we design OUT the immersion heater backup systems, indeed the MCS standard doesn't allow you to consider the immersion backup in normal operation.

Choosing the right type of heat pump for the designed environment is critical. Manufacturers quote A7/W35 as a default because that is the EU standard, performance figures for designed outdoor temp and flow temp are all available.

Some heatpumps (checkout C02 heatpumps) are more than capable of providing 60° at high SCoP's
..

99%+ of plumbers and gas/oil engineers don't have a clue how to install or configure a heat pump system.
I quite agree. And with the system in question (and also with a couple of wood pellet systems some years ago with a different supplier) we went to supposed 'experts'. In the case of the ASHP it was inconvenient as at the end of the day the main contractor ended up with less spare capacity on the substation, however with the pellet systems the saga dragged on for nearly five years and cost a bundle.
 
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