@jamespa Should have added I have paid for cable to be made safe by having chimney repaired and lined. It needed to be done so that I could safely have a wood burner installed. The engineer is local and known to do an honest job,

Posted by: @dwynwen

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@jamespa Should have added I have paid for cable to be made safe by having chimney repaired and lined. It needed to be done so that I could safely have a wood burner installed. The engineer is local and known to do an honest job,

Noted.  Passing services through chimneys appears to be common; I have a soil pipe going through one of mine (not live)! 

I suspect that, unless builders can see a live appliance in a fireplace, the assume that a chimney is no longer in use!

As I say upthread, if you do decide to do keep the ASHP and panels, are committed to doing so, and would like to summarise the current position/remaining issues in a list, I am happy to try to offer some low cost suggestions for partial or full mitigation.

@jamespa It makes sense to keep ASHP but no idea how it works, how to operate economically.

Not long ago I would have enjoyed learning all about it, making fine adjustments, but I am too tired, weary, old. All I wanted was a trouble free system and no need to carry solid fuel.

Posted by: @dwynwen

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@jamespa It makes sense to keep ASHP but no idea how it works, how to operate economically.

Not long ago I would have enjoyed learning all about it, making fine adjustments, but I am too tired, weary, old. All I wanted was a trouble free system and no need to carry solid fuel.

I understand. 

The great thing about ASHPs is that, once set up, you can pretty much forget about them completely.  If you can you tell me anything about how it is currently set up and how you have been operating it I may be able to suggest some easy tweaks

eg

• Do you have TRVs or a thermostat, if so how are they set (eg at least 2C above the target temperature, to maximum or at the target temperature?
• Is the system operating on 'water law' if so do you know the settings, have you adjusted them since the installer left?
• Do you have it set to operate 24x7 or is it set to come on and off?
• What electricity tariff do you have and do you have a smart meter?
• How is the DHW set to operate (target temperature and when is reheat scheduled).

Regarding the DHW tank if you wanted to post a picture I might be able to comment.  The price you have been quotes seems excessive (to say the least) but it does depend on the details.  Do you know where you would move it to.

For £50 per year Havenwise will remotely control your system and optimise many of the settings, so long as you already have the wifi interface.  I don't use it because Im happy to tweak myself, but those who do seem to be very pleased.  I think you get 6 months free trial, which is essentially a whole season.  It might be an excellent investment.  For the avoidance of doubt I have no connection at all with Havenwise.

Don't feel obliged to respond, but if you do we may yet be able to offer some suggestions.

@jamespa Thank you taking time to help. I have read so many posts, watched and listened to discussions and become more and more confused. So many capital letters.

There are thermostats on every radiator, all set to different values, a couple are loose, just balanced.

It is set to only heat water, off and on.

No idea about 'water law'. However I have been slightly worried about Legionnaires after reading some posts as water untreated from well.

Settings have been changed. A plumber came to mend water leak, not contractors, and adjusted DHW temperature.

No smart meter, tariff set by Ovo claiming to be most economical.

It would have been so good to have trouble free heating but that enjoyment has been spoiled by noise and so much damage. I have said before that I am aware of global heating, wasted resources, have been boring people since early 1970s. Don't think poorly insulated external pipes help climate or my bank balance. Images below show unnecessary damage and sagging insulation, not all just examples.

Whilst the insulation as you have depicted it is far from perfect, its not going to make a massive difference.  That said its fairly easy to fix when the time is right.

The exposed pipe in the second picture is the one I would prioritize at this stage, reserving a fuller review for possible later action.  It looks like the insulation is there and just needs a cable tie or piece of string to wrap it round the pipe properly to seal it a bit better, and maybe some insulating tape over the joint to stop water getting in..  Is there someone (eg a neighbour/friend) who could do this for you?  Alternatively if you have a plumber round at any time for something else, they could tack it on (its not worth a special trip!). 

Legionnaires should be dealt with through a weekly cycle which the contractors should have set up for you. There should be a day of the week (the day when the legionella cycle is done) when the DHW is noticeably hotter than every other day (unless its always piping hot).  If there isn't then this should definitely be checked.  Its called 'Disinfection' in Samsung-speak and is installer setting 3041-3046.  If you know how to get into the installer menu then you can check yourself otherwise I am sure someone here can talk you through it.

You dont say whether the DHW heating is otherwise satisfactory or not and what temperature its now set for, and whether you are happy with the cost.  Perhaps you might comment.

Attending to both these will ensure DHW is set up properly.

Once those are done I think the key thing is to get the control of heating working and properly adjusted.  This takes time, but is worth the effort if you wish to do it.  However its difficult to do properly until it gets colder, so best 'parked' for now until DHW is definitely fixed.

If you do wish to improve things then happy to walk you through on this forum, but stress that there is no obligation.  Best take it a step at a time rather than getting overwhelmed with everything at once!

@jamespa Thank you once again. If I was able insulation problems would have been fixed by me but then I wouldn't have needed ECO4, tank would have been installed in a place chosen by me. One assessor said outside plumbing would have been unnecessary if tank had been installed downstairs which would have been my preference if asked.

Thanks again to you and Mars.

Posted by: @dwynwen

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@jamespa Thank you once again. If I was able insulation problems would have been fixed by me but then I wouldn't have needed ECO4, tank would have been installed in a place chosen by me. One assessor said outside plumbing would have been unnecessary if tank had been installed downstairs which would have been my preference if asked.

Thanks again to you and Mars.

All noted and accepted and as I say I am sorry that you have been put through this.

However, if you want to move forward, you will need to put the past behind you and deal with what you now have, not how you got there and what may have been different along the way.

The offer to attempt to help remains open, but the ball is now in your court to respond (or not as you choose) to the questions asked and suggestions made.