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Alan. It can be installed in a kitchen or bathroom, but it draws air in from outside.  Due to the site restrictions for pdf files, I could not upload a better version, albeit in ½ûÂþÌìÌÃ. If anyone wants to see the full file, then if they let me know their email by PM I will quite happily send it.

Hi Penny. It is a new product announced very recently. It only produces domestic hot water, but even so it is ideal for holiday homes etc. There are larger models for higher water usage though. It works basically the same as a normal air/water heat pump, but without the heating mode.

My main concern with just having a black tube to heat the water, would be the possibility of Legionella. The water would have to be over 50C to eradicate the bacteria, so if nobody stays in the house for a couple of weeks then they would have time to breed happily. That is just my view, as would not like anyone sued for killing off their guests. If you want a reasonably cheap hot water system, then it is worth looking at the new Ariston Nuos. This unit is circa E1000 so may be the answer as can be sited inside a cantina. Re inverters, these are air/air heaters with air conditioning included.

Atessa While Bunterboy's reasoning is fairly sound, in my opinion you would struggle to create very much hot water for a winter letting scenario. 80 ltrs is not a great amount of water, especially if a couple of people want  showers and water for washing up in a day. Maybe ok if the sun is shining, but in winter forget it. Think about inverters for winter heating.

We are in the middle of making lots of chutney etc.  Spicy peach, tomato chutney already finished and tomorrow tomato relish all using wine vinegar. In a couple of days green tomato chutney  Have also made a very tasty peach jam. Soon be time to freeze a load of swedes (vegetable ones!!) that have grown really well.

Atessa Here is a link to a UK moneysaving discussion forum. It is over 45 pages, but will give you a better idea.

You can keep track on what they have on offer here:

Sorry Atessa if I confused you. Air/water is a heat pump and not to be confused with solar etc. It heats domestic hot water and also provides heating for the house via the installed system.

Best to forget it here, use white/red wine vinegar, or cider vinegar for the recipe, we do here for our chutneys etc.

Sagraiasolar will obviously be able to give you more advice, as he is using a PV setup, Solar panel heating for DHW and a heat bank system. PV @ 3Kw would probably only be suitable for normal domestic use ......... to heat the hot water you would either need electric heaters or solar/ wood burners and then tie these in with the heating system for the house as well. If you think you will get everything free, then you will need a few more Kw than your geometra thinks. A 5 Kw PV array would run a 9Kw heatpump quite easily, which would provide your DHW and heating in one unit. OK, a heat pump is more expensive in the first instance if you use Ground Source. but a Air/Water unit would be less. Fillide and Alan have both put very relevant points, so I think you ought to consider very carefully what you need, before getting bank loans, plus having to include all the extras required. Also remember the payback is graduated over the years, and could even be withdrawn at any time, before you sign the contract!!!