Truly everything has worked as well as I could hope and I am very pleased (with one exception-isn't there always an exception? an intermittent and annoying problem with my gshp ). As many homeowners have found I also cannot get any help from the Italian manufacturer or their UK distributor both of whom appear perplexed by my problem. The distributor quoted me £720 to call but said that they cannot guarantee to resolve the issue which I found unacceptable. My expenditure is within acceptable parameters. My electricity bill is more than before naturally. However I no longer have to buy heating oil which ran an inefficient combination boiler from which we had slow flowing and limited amounts of DHW. Now we have copious amounts of DHW from our 500litre solar cylinder and UFH that has us running around in our under-ware. Taking into account all the circulating pumps I have installed including the 2.5 HP rain-harvesting pump I have no complaints. In any case my FIT payments for the PV adequately cover the electricity costs.
The 50,000litre rain-harvesting tank is brilliant. I built it myself and I get ground water seeping into it and it is full all the time but it isn't a problem. Surplus water overflows to a ditch and away to a dyke. Water is pumped up to tanks in my loft which then supplies our W.C s and washing machine. Our water bill is less now than it used to be which is very pleasing.
I have a keen interest in renewables and decided to install all the technologies myself which I have done.(including the ground loop for the gshp). I have had the luxury of time to do so and a most suitable property to install them in. In doing so I have learned a great deal about the nuances of the components both from an installers point of view and as a user and am happy to share any of my experiences.
I definitely recommend the technologies but finding installers who one can put one's trust in is something else. There is nothing one can do to ensure a successful outcome. The Government insist that only MCS registered installers can competently install the products but I submit that that is no guarantee. Suppliers of gshps do not appear to have the expertise to solve problems that can arise except for Kensa and Calorex who manufacture in the UK (I do not have either of these but in hindsight should have)
Insulation in every orifice is key to success with gshps and I have enveloped my house. Under the floors, inside and exterior walls lined, 350mm thick in the loft tucked into the eaves in an effort to make it airtight and it was very worthwhile doing. Of course you then need a MVHR system to expel foul air.
I emphasise that these are my observations and opinions derived from my experiences