@littlered 

Hi LittleRed,

Welcome to the forum.

If you would like to share some information about your system and home I feel certain that the forum members will attempt to improve the efficiency of your system.

What model Daikin do you have? How large is your bungalow? Do you have any information about heat loss? How well insulated is your Home?

@littlered 

Hi and welcome to the forum.  We have a 4 bed bungalow build in 1990, with an ASHP and radiators.  In theory, yours (2 bed, new, ufh) should be cheaper to heat. Yesterday was our most expensive heating day this year at 44.4kWh/£9.  The house was warm throughout at 21-22C.  We currently have the heating on 24 hrs.

You should be able to do better than £12; ASHPs all work the same way and Daikin is a good make.  Is that £12 for just the ASHP or everything? Can you see how much energy (kWh) your ASHP uses for heating and hot water?

Unfortunately you won't get better than 21p/kWh for now.

Kev

@derek-m Thanks for all the replies so far. It is a Daikin Altherma 3M. The bungalow has 2 average sized bedrooms, an en-suite shower room, bathroom, a living room, kithchen/diner which is partly a sun room (solid roof, not glass, but glass walls), wide hall and a garage. It is brand new, only lived here a month and we are at the mercy of the developer's information which is limited. We understand it has all been installed to Daikin's approval with sufficient insulation - not sure what that means. The loft looks very well insulated - much deeper than any we have seen before, but not sure what goes in the walls. There are no radiators, just all under floor. Each room as its own thermostat.

We were told not to turn the thermostats down more than 4 degrees at the 'comfort temperature', so during day 20-21, then in the evening, we turn the main two rooms down to 15-16. The bedrooms and bathrooms, we keep at around 16. We tried leaving the thermostats on in most rooms overnight at 18, but it was very expensive, and we lowered them to 14 in main rooms and that took an age to heat up and was very expensive. 

What we are hoping to find out is which is the best, that is cheapest, way to maintain a comfortable level of heat, is it by leaving the thermostats permanently set at around 20 (which is a temperature that suits us) or lowering them overnight. 

This morning I got up around 4.30am to check and in the main rooms where we had lowered the temperature to 14, the thermostats indicated the heating was on and now at almost 9am, they are still only at 15, which makes us think we should have left them higher, but how high, or is this the right way is what we are trying to establish.

@kev-m Hi, yesterday somehow we used 60 kw. We did not feel warm either. Do you find it cheaper to leave the thermostats on overnight and if so at what temperature do you set it overnight? Do you lower the heat output overnight or is it best to leave it? We are currently lowering it but finding it takes an age to heat up. Looking for the cheapest solution really. Our smart meter only shows the total KW usage.

@littlered pretty sure what you are doing is actually the worst way to run your heat pump. The view you will find has two basic steps

1. Find your heat pump controller and see what the weather compensation settings are - THIS IS THE SINGLE MOST IMPORTANT THING
2. Set all of your stats to 21/22 degrees on constant
3. use the weather compensation to maintain that temperature

What you are doing if forcing the heat pump to work extra hard (high temps) in getting the rooms to temperature, then turning off. What you want is lower temperatures (around 30 degrees) and on constantly. 

As a note: I have a 262m2 house with rads not underfloor heating. I used 75kw yesterday keeping the house at 21 degrees all day and night. You 100% have a wrong setup somewhere

@batalto Hi, I am not sure where to find the weather compensation settings, I suspect they are in the loft where the fitter put it. He told us not to alter any of the settings in the loft and just to use the thermostat? So, do you mean I should set all the thermostats to 21ish and leave them like that? It's amazing that the developers have just left us in the dark like this with a new heating system, we were just told to use the thermostats to suit us at our own comfort levels and given a small instruction book about the thermostat use. May have to venture into the loft.

@littlered 

I'll copy your replies to  your other thread and reply there otherwise it will get very confusing.

Kev

@kev-m THANKS

Posted by: @littlered

Our developer has told us that on this site, when the pumps were being planned for this site, electricity was cheaper than gas. The government should be subsidising those of us who opt for eco friendly heating methods, and the suppliers should be reducing their costs too as an incentive otherwise nobody will move from gas ever.

I don't recall electricity ever being cheaper than gas per kWh consumed. Maybe they meant the output would be cheaper overall, as with a COP of 3 your ASHP would be 300% efficient per unit of heat, and a gas boiler around 90% efficient at best. 

You are 100% right, the subsidy should be applied to "green" methods, but bizarrely gas is subsidised at source by the government and eco-friendly alternatives in the electricity market inflate the unit price for everyone. This to me means that net a ASHP user on a "green" electricity tariff is directly subsidising someone with a gas boiler. How can that be right?

@pauldavies83 Yes, sorry, I think they meant efficiency. I am going to write to my MP about the cost and lack of incentives for eco friendly systems. I think we should all lobby about this.

Hi, Eon are advising me to switch to a two rate tariff ie economy 7 overnight with my ASHP, but they cannot tell me the rates until I agree to pay to change the meter. Most of what I have read is that ASHPs use most energy during the day anyway, so is it worth paying for them to install a two rate meter and switching or not. Not had sufficient time to judge whether we use much at night at all, but from smart meter over last couple of weeks night usage is very low, so is it worth it or not, any advice appreciated.

Cheaper day today because it is warmer outside, just getting used to the fact that this type of system is weather dependent and works least efficiently when you need it the most.