Underfloor heating and AFHP

LisselleC

matelodave and matelodave - thank you for taking the time to construct such comprehensive replies. £800 per year for an electricity bill sounds pretty steep but I suppose is all depends on the size of your property and the level of insulation. I think the best idea would be for me to get a heating engineer, who is familiar with my type of system, to come and take a look and advise me.

Cardew

LisselleC wrote: »

matelodave and matelodave - thank you for taking the time to construct such comprehensive replies. £800 per year for an electricity bill sounds pretty steep but I suppose is all depends on the size of your property and the level of insulation. I think the best idea would be for me to get a heating engineer, who is familiar with my type of system, to come and take a look and advise me.

Why would 800 pounds be steep in an all-electric dwelling incluing heating and hot water? The average in Uk even with gas is £1,300.

Why pay a hefty fee for a heating engineer when the information is all available on line.

matelodave

As Cardew says £800 for my total energy bill is pretty good as it covers everything, cooking, heating, hot water, washing, TV, lighting etc.

I could get it down to less if my wife wasn't such a chilly mortal and put a bit more effort into turning stuff off and learned how to properly load the dishwasher, washing machine & tumble dryer (we seldom use the clothes line).

We had the system put in when we moved in and refurbed our 140m2 bungalow (average insulation) five years ago and I've kept a monthly record of the meter readings since then.

On average we use about 1250kwh in January (worst was in 2013 when we used 1500kwh) and around 300kwh a month between May and September although this year in May we used 430kwh because it was colder than usual.

Most ASHP are specified at 7 degrees outside with a flow temperature of 35 degrees so the closer you can get to that ideal then the lower your energy bills will be.

Obviously there's not a lot you can do about the outside temperature but the lower the flow temperature the less it will cost you. It's reckoned that your costs will increase by about 2.5% per degree above the ideal 35 degree flow temperature.

It's worth having a look at the LPG, Oil & Other thread as there are a couple of stickies one for ASHP and another for GSHP which are both worth a look through (some people get them confused) to see how some people have sorted out their systems and got them optimised.

A properly designed system (including the heating and controls) correctly configured and operated should work well, keep you warm and be economical to run.
A poor system or one not operated or set up properly will cost a lot and you'll still be cold

[Deleted User]

Mitsubishi ASHP here and total annual electric bill is currently £744 for all heating, hot water, lighting, cooking etc...

~1906 large detached bungalow.

Looks like we all have similar bills here

I've been updating appliances and adding yet more LEDs so still scope for more reductions

But yes it can be tricky to fine tune the system especially with a combination of UFH and rads.

Cheers

Nada666

LisselleC wrote: »

We have 3 living rooms, a porch and a shower (electric) room/toilet downstairs, and two bedrooms and a bathroom upstairs. We have triple glazing and kingspan insulation.

Downstairs - lounge with underfloor heating; dining room with radiator; kitchen with gas AGA (cooking only) plus radiator; porch with radiator; shower room/toilet with heated towel rail.

Upstairs - two bedrooms, bathroom and landing with underfloor heating; plus heated towel rail in bathroom.

The house is occupied throughout the day.

LisselleC wrote: »

£800 per year for an electricity bill sounds pretty steep

You've got me scratching my head!

Smiley_Dan

How many m² are we talking? If the house is well insulated and air tight then the Aga would probably heat it on its own (at great cost).

lstar337

Smiley_Dan wrote: »

How many m² are we talking? If the house is well insulated and air tight then the Aga would probably heat it on its own (at great cost).

AGA is cooking only, as per OP.

Smiley_Dan

There's no such thing! I should know, as I have one. The amount of energy kicked out is not trivial.

Richie-from-the-Boro

Smiley Dan - which type do you have ?

LisselleC - which type do you have ?

Gas, leccy or solid fuel, Modern AGA gas is just a standard but expensive conventional direct heat cooker with no heat retention properties. Heat storage AGA's are cast iron poured cookers with the usual heat retaining bricks no different to our night storage heaters and a 30A cheap overnight electricity supply & tariff.

Smiley_Dan

Oil fired heat storage. Sorry, I assumed it was a heat storage cooker. You might be right, it might be one of the new ones.