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During the spring of 2014 I embarked on the process of installing a Ground Source Heat Pump
(GSHP) at my property to replace my aging kerosene boiler. I always intended writing a testimonial
for the company but decided to wait for a year so I could fully evaluate the performance of the new
As a novice to renewables I selected three MCS accredited companies to quote for the contract to
install the system. I was limited in garden space so could not opt for the traditional trench system
and had already decided that a bore-hole system was the best option for my property.
The three companies all surveyed my property and each came up with their own design and costs.
As I had already decided on a bore-hole system I expected three very similar designs and prices. This
could not have been further from the truth, as three quotes varied vastly in price, specification and
equipment. I also decided at the point to install a solar array to offset the additional electricity the
new GSHP would use.
After a great deal of research I opted for Graeme Ross from Greystone Energy as out of the three
he appeared to be the most knowledgeable in terms of my requirements. In addition, I was taken to
a couple of his previous installations and was able to see first-hand the quality of his work.
July 2014 the drilling team arrived and started to drill the bore-hole. I had already been pre-warned
by Graeme that if the team hit water they may be forced to drill a second bore-hole and that would
increase the cost considerably for the drilling team. Well, as luck would have it, they did hit water
and had to drill the second bore-hole, as the alternative was to abandon the project and lose the
money already invested in bringing the drilling equipment to the site.
Two bore holes, of approximately 100 meters, were successfully drilled into my drive and the
installation of the heating system started. The old oil system and radiators were removed from the
property and new oversized radiators were installed. Ideally this type of system should utilise under
floor heating but as I did not want to go to the expense of this type of installation I opted for a
radiator system. One of the other companies that quoted intended to utilise my existing radiators
from my old system. From my experience over the last year, that would have been no use as with
the lower heating temperatures generated by my NIBE 1245 GSHP, I am confident that the old
radiators would not have had a sufficient output to adequately heat the house.
The installation team were excellent, despite my house being fully furnished, they lifted carpets,
floors etc and always left the house clean and tidy. The installation of the heating and the solar array
took just over two weeks and I am 100% satisfied with the quality of their work.
The system was commissioned in August 2014 and it took a number of months for me to get to
terms with the new system. We had a few teething problems with the system, but Graeme and his
team were excellent and resolved them quickly and without fuss.
It has now been a year and I have evaluated the data and cost from my old system against the new
GSHP and Solar Array.
Over the previous four years my oil use was consistent as I saved £175 per month to cover the cost
of my annual oil consumption. At the end of the year I never really had much of a surplice in my oil
savings so it is fair to say my annual oil consumption was 3000 litres at an average cost of £2000. I
appreciate the cost of oil has fallen dramatically in the last year but when I embarked on the process
I was paying between 60 and 65p per litre.
I have also looked at my electrify consumption for my property and in the 2 years prior to the
installation of the solar array and GSHP I used 7471 & 7367 KWH at a cost of £1049 and £1046
respectively. In the 12 months since the installation I have used 11917 KWH at a cost of £1456. This
shows and increase of approximately £400 per year or £33 per month.
Therefore my total annual fuel savings amounts to £1600 per year.
The solar array I installed has generated 4.13 MWH of which I have used approximately 60% as free
electricity and exported 40% back to the grid. The way the system works is that I get paid for the
entire 100% of the electricity I generate whether I use it or not, which amounts £680 in FIT payments
this year. I will receive these FIT payments for 20 years.
I also receive £2,800 in GSHP FIT payments per year and will do for seven years
It would be unfair for me to tell you how much the installation of my GSHP and Solar array cost, as
every installation is different. What I can say is that I will have recovered the full cost within 7 years.
So if you are considering a GSHP I would recommend Graeme Ross of Greystone Energy as
someone you should contact and let him explain the pros and cons of such a system. I am sure that if
you have any doubts and want an opinion on his work, then they will point you in my direction.