Air Source Heat Pumps

Cardew

merlinonline wrote: »

Rate 2.

1. 28100.16
2. 28118.72 (18.56)
3. 28137.89 (19.17)
4. 28155.85 (17.96)
5. 28173.31 (17.46)
6. 28196.69 (23.38)
7. 28213.47 (16.78)
8. 28242.38 (28.91)
9. 28264.41 (22.03)
10. 28281.00 (16.59)

these are the numbers which do not have a rate

1. 45474.40
2. 45494.63 (20.23)
3. 45515.97 (21.34)
4. 45536.55 (20.58)
5. 45557.57 (21.02)
6. 45582.50 (24.93)
7. 45603.69 (21.19)
8. 45635.47 (31.78)
9. 45661.01 (25.54)
10. 45680.44 (19.43)

It appears that the 'numbers without a rate' are(approx) the addition of Rate 1 and Rate 2. So Rate 1 is economy 7 and rate 2 daytime. So 206 units in 9 days.

As you are not on an E7 tariff, Eon will just use the total figure for billing on a 'normal 24/7 tariff'.

merlinonline

Cardew wrote: »

It appears that the 'numbers without a rate' are(approx) the addition of Rate 1 and Rate 2. So Rate 1 is economy 7 and rate 2 daytime. So 206 units in 9 days.

As you are not on an E7 tariff, Eon will just use the total figure for billing on a 'normal 24/7 tariff'.

So on the basis of 15p per unit (I know it could be 7p) it works out about £30.90 for the nine days?

Not including daily standing charge

Cardew

merlinonline wrote: »

So on the basis of 15p per unit (I know it could be 7p) it works out about £30.90 for the nine days?

Not including daily standing charge

Well you shouldn't be paying anything like 15p per unit on a normal single rate tariff. There are plenty of tariffs even now, under 12p

However even at 15p(plus standing charge) it comes in at under £4 a day.

I am surprised that the reading on the E7 off-peak meter is so low(around 2.5kWh a day) with an ASHP. It cannot be working for heating or hot water during those 7 hours.

merlinonline

Cardew wrote: »

Well you shouldn't be paying anything like 15p per unit on a normal single rate tariff. There are plenty of tariffs even now, under 12p

However even at 15p(plus standing charge) it comes in at under £4 a day.

I am surprised that the reading on the E7 off-peak meter is so low(around 2.5kWh a day) with an ASHP. It cannot be working for heating or hot water during those 7 hours.

During the night I just put the thermostat at 16C, the house temperature has never dropped below 18C so nothing is working. Only need minimal DHW as have separate electric shower (don't do baths). The only thing that running throughout the night is the fridge and freezer and maybe the charger for mobile phone.

But the hot water is meant to come on sometime before dawn. Trouble is there is no one who is available to tell you how to get the best out of the system so its all pretty much trail and error.

Terrylw1

Cardew wrote: »

On the other hand I have never heard of a meter with 7 digits - one of which being the decimal place.

Cardew, just to add onto this, there are certain Ampy meters that have up to 2 decimal places on the them.

The Data Transfer Network (DTN) that readings are sent across has an upper limit of I think 9 main dials and I've seen a rare few domestic customers with 7 or 8 main dials.

Baz@rr

Hi all,

Just reporting back. The man from Grant came out and managed to fix the ASHP. The medium flow switch was faulty and was preventing the fan from spinning. Now that it's working we're definitely seeing a vast improvement in our electricity usage. It has dropped by a third at least, if not a little more.

One question, though. I've been taking note and temperature of the radiators never goes up beyond 36 degrees. Those are the ones upstairs. The larger radiators downstairs sit at around 33 degrees, even when we crank the thermostat on the wall up. I know the radiators in an ASHP system are lower than in other systems, but this seems a little too low to me. Maybe I'm wrong, though. Does anyone know what sort of temperatures the radiators should be outputting?

Baz@rr

I've also just been out after noticing the rads were cold and discovered the code EE 1 flashing on the control panel in the garage and the pump sitting doing nothing. This is the third time since it was fixed on Wednesday that it has done this. I was hoping it was a teething problem that would go away, but sadly that doesn't seem to be the case.

I looked up the code online and discovered it means: High pressure - circulating pump failure or circuit air locked.

Switching it off at the mains and back on again seems to cure it, but clearly there's something wrong. Could the system just need bleeding?

lovesgshp

Are there any air bleed valves on the heating circuit, as this is a normal problem, with air in the system?

Baz@rr

Geotherm wrote: »

Are there any air bleed valves on the heating circuit, as this is a normal problem, with air in the system?

Um... pass. Where would they be? On the radiators? The rads feel (marginally) warmer at the top than they do at the bottom, which made me think they may not need bleeding.

I know it's an easy job to bleed them, but I'm loathe to do it as I don't want to be accused of mucking about and causing the problems in the first place. For the sake of twenty minutes, though, I might just go round and try bleeding all the rads.

Saying that, though, the copper pipe that comes out of the floor and into the radiators doesn't feel particularly hot either. In fact, both the in and out feel much the same, and I'd be hard pushed to say which was which.

lovesgshp

There may be some bleed valves close to the heat pump, without a photo of the setup it is hard to say, but it points to being a high delta on the output side.