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The second quote looks promising with the extra HW but the difference between the two units is 3.5 Kw so is the second unit less efficient. I don`t know about the LG unit but would expect its efficiency to be close to the Mitsubishi unit so why the increase, the only thing that comes to mind is that less radiators are being changed for the LG so maybe it`s the pipework and rads that are less efficient. Based on my own installation then only the bathroom and cloakroom radiators were left unchanged. Whoever you employ I cannot emphasise enough the importance of `SETTING UP` the system correctly to your criteria, so, if possible, check out their reviews and don`t be afraid to ask for proof of previous installations and try and speak to these people. It`s a very large financial commitment (well is was for me) so getting it right first time is the `name of the game`. My system was correctly installed but set up proved to be a problem before Mitsubishi stepped in to make the final tweaks, bearing in mind that my main contractor also ran a training school for ASHP installers accredited by Ecodan My system is currently maintained by a company whose chief engineer has exactly the same installation as mine, he is young, very tech savvy and definitely knows the system inside out along with the knowledge to make positive adjustments CHRIS P .

My house is 6 bed semi (1960s) with 22 radiators which was converted from LPG to ASHP 5 years ago with great success after a shaky start. My own installation was obviously retro fitted with the radiators being, in the main, replaced for `doubles` after being worked out by the plumber. My criteria was specific in that the main rooms had to be capable of reaching 25 degrees due to my wife's ongoing health problems The system had to generate enough hot water to supply 2 bathrooms, 1 ensuite, 1 cloakroom and the kitchen Resulting system was Ecodan 14 Kw outside unit, matching Hydrobox in roof space plus 300L HW tank also in roof The system is run as a `normal` boiler would run switching off at night but on all day The HW temperature is set at 42 - 52 degrees which is very hot without being scalding We encountered difficulties at the start due to the system wanting to remain in economy mode all the time but finally fine tuned by Mitsubishi Best advice is to find an experienced and successful installation team (electrician + plumber + refrigeration engineer + someone experienced in setting up these systems to your criteria). The Ecodan system is biased to always maintain hot water in preference to the heating system, apart from that we are extremely pleased with the system and its reliability My RHI is £240/quarter and the system cost £12500 to install running costs are £220/month for my all electric house We also have a 4Kw solar panel system but would also recommend solar hot water panels Obviously the costs would be considerably less if household temperatures were lowered, however not possible in my case Hope some of this helps CHRIS

Hi New to this forum but I have completed several renovations and extensions with one more on the horizon as my daughter moves in to the adjoining semi that needs a full overhaul of the services and the structure. Hopefully my son in law will be here to do the brunt of the work but he often works abroad so only time will tell CHRIS