Air Source Heat Pumps (ASHP) - How have your energy usage and costs changed since getting one installed?

Thanks that is interesting and what I  wondered having read about the radiators. 

It is almost as though the radiators were designed and built by a completely different company given that there is no integration with the heat pump controller and all the radiators are stand alone.  I can't help thinking that is going to introduce some inefficiencies.

I did quite like the idea of them initially.

Thanks for your time replying to questions. 

The i-life rads are actually labelled Climaveneta which I think is part of the industrial side of Mitsubishi. A friend commented that they're very like the office radiators he used to install. I wonder if they are starting to push them into the domestic market but haven't yet done the work to make them integrate properly with modern domestic heating control systems.

Back to "normal" electricity use yesterday. Still over 30kWh but that seems to be standard in cooler weather. It is a bit frustrating being unable to take advantage of a two rate tariff or a TOU tariff to bring the bills down, particularly as our system, with heat batteries, is perfect for it. But I'm using the trial period to learn how the system performs so when it ends I'll be better informed and able to choose the best tariff.

That is good news. 

Do the Heat Batteries help with the domestic hot water and the central heating in your setup. 

Good to see so much shared learning from all this investment in the trials. I hope we see more in general over the next year. 

The heat batteries allow for some of our energy use to be moved to different times of day but I suspect they have a negative impact on our electricity use because they require hotter water from the heat pump to charge them. Also, one of the hot water batteries is charged with an immersion heater so that's using even more electricity. This wouldn't be a problem if we could charge the batteries overnight on a cheap rate.

@M.isterW I would be interested to hear about your heat battery setup. Are these heated by resistive elements or the heat pump? If the former I can see why you would be interested in changing tariff. 
Also do you have a split between kWh for the heat pump and that for the sunamp?

We have two batteries that feed into the central heating and these are heated by the heat pump. The timing for when these are charged is currently controlled remotely, by the Kaluza platform.

We then have a battery heated by the heat pump for hot water (controlled by Kaluza) and a second battery, also for hot water, heated by an electric heater. Our water goes through the first battery where it's heated to 43 degrees then through the second battery where it gets to 65 degrees.

I can see how much electricity the heat pump is using and how much the entire system is using (pumps, heater, valves etc) but it doesn't break down into any more detail.

What’s the thinking behind the concept of taking the DHW as high as 65degC @M.isterW ?

It’s now common practice to fit thermal mixer valves in houses in order to prevent children and elderly people being scalded. the common default setting for these is 42degC.

So by that logic the additional rise from 43-65deg in your house is superfluous…. and goes against safety guidelines.

We have a mixer valve so we don't get 65 degree water at the taps. We get hot water at ideal shaving temperature 😊

The second heat battery heats to 65 degrees by default. There's no way to turn it down. I assume it's been installed to keep us in hot water if the heat pump isn't working (like an immersion heater in a normal hot water cylinder).

I have wondered what temperature water we would get if I let it run down and didn't bother recharging it.

@Transparent I think it may be the temp required to ‘phase change’ the Sunamp.