ASHP vs Electric central heating system

Smiley_Dan

Sounds attractive but what's the COP of such a low output A2A heat pump at, say, freezing temp though (i.e. winter operation)?

lovesgshp

spudofcongeith wrote: »

sorry i shouldve stated that the house is not even under way - the site is still a green field. lots if investigative work to do so minimal mistakes are made when the build starts, hopefully!
thanks tiredgeek, that was a worry about its effieciency in freezing weather, and compared to were you are we're a soft southerner lol (D&G).
we've had plenty of quotes from ASHP companies both RHI registered and not and yes they aint cheap! the payback is not as good as other renewables and im not sure in a really well insulated house if the usage would be as the companies are trying to suggest?!
if only we couldve done GSHP, we wouldnt be in this pickle....

What is the finished heating area of the house, and how much ground area have you available?

spudofcongeith

GSHP was our first choice but the ground surrounding the house is V stoney i.e the price it will cost us to get a v large digger in to dig the trenches is not viable and as for bore hole...yes if we won the lottery that would be a very feasible alternative lol!!
110m/2 foot print downstairs with 70m/2 potential development upstairs...

Johnandabby

More importantly, what would you need to comply under Part L of the Building Regulations for England, and Section 6 for Scotland? You may find that direct electric heating wouldn't be a compliant option anyway.

Your architect should be able to look at a SAP calculation to determine whether this is an option or not.

lovesgshp

spudofcongeith wrote: »

GSHP was our first choice but the ground surrounding the house is V stoney i.e the price it will cost us to get a v large digger in to dig the trenches is not viable and as for bore hole...yes if we won the lottery that would be a very feasible alternative lol!!
110m/2 foot print downstairs with 70m/2 potential development upstairs...

Very stoney, is not a real problem. You are only going to be excavating to a max of 1.5mtrs x 1.2 mtrs wide, by probably max 100mtrs x 2. Sand bed for the probes, with a covering of sand.
If you saw some of the instals we have to do, through enormous lumps of rock, then yours would be easy!!! 2 days for the digger should be enough.
GSHP size for your property, depending on insulation max 11kw, but could be down to 6/7, whereas excavations can be much shorter.
HTH