scottishjohn

surely money would be better spent in wrapping the house in insulation first to drop the energy requirement . If its a BIG old house with lather +plaster and high ceilings , you could always bring your rooms in by 6" on each wall and make an air tight insulated house inside that house by making stud walls + new insulated ceilings +vapour barriers to seal it all seen that done very effectively in a big house --no demolition just all new walls and new wiring etc ,dead easy to do while you live in it then the money you save on running the house will pay for the ASHP just a thought if its BIG old house no point in ashp till house is at least have decent thermal wise

DO NOT go gshp --it is not the way in uk climate --cost to do will never be economical -- £20-30k for that If in canada ,where you get -20c for months yes --not in uk ASHP 2-8k depending on who does it will still run down to -18 --but not as effiecntly as GSHP --but thats one week every year ? ASHP is the way --but you need electric for that now you need to say how big this is going to be and can you bring it up to nearly passiv insulation values -- that will dramtically drop your energy requirement

wave a cheque usually works .LOL

not saying this is the best one, but all work the same added to solar pv +batteries you got it sorted all year round no matter the snow etc www.homeheatingguide.co.uk/central-heating/baxi-ecogen-micro-chp-combined-heat-power-boiler-replacement

"chips" system actually CHP micro boiler--plenty of makes about and you get RHI as well boiler that makes electric as well as heat add that to all other modern techs and you are there -just got to feed that with oil,or gas in depths of winter

clay is what they used to use to make the canals water tight -+romans used it for aqueducts -works very well if kept wet and don,t dry out

email them --but use googgle translate and send it in both english and french

the "amptec" boiler already has temp controls etc simple loop with divertor valve+ pump and it will just deliver water at temp you set. I used one as my inline back up for solar thermal UFH system found one very cheap compared to normal proce --brand new on ebay or use an electric shower unit maybe would work the same . from what i can see a willis heater needs a tank to fit it into and then you back to thermal losses

using a variable speed pump would make you think that too much heat is a bad thing ,they are trying to lift thetemperture of whole mass evenly ,so localised boiling must be a problem and that will be why they limit the electric type to make sure plenty of volume around element at a low temp when it starts up with a thump

its called an inline boiler --"amptec " unit

how much cheaper are the basic unit with no electric element --are they much cheaper?

maybe the heater element should be in the water system AND pumped around a closed loop ,then heat distriibution will be same as early unit could all be run from the pv circuit

35000 full cycles prpobably not partial cycles ,which could alter results and I, m guessing that the tests were done with firsttype water heated unit --not electric element type unit-- will be total differnet heating path I,m not scaremongering suggesting possibilities for discussion

is the real problem one of cycles ?. i know that lithium -ion batteries all have a max cycle capacity ,my impact gun is 2000,after that the charger will not charge it , and every now and then i have to totally flatten battery to make all cells equal again whe i asked they told me it was heat problem and at end of life it would just keep heating and not totally filling up . I understand its not electric,but if it was water and you kept boiling it and freezzing it would change its make up ,maybe the pcm has same problem --so they want to make sure the servicelife is not shortened by lots of small charges?? electric cars are same --run them down to 20% -charge up to 80/90% for best life ? or is it like "bomb suprise" where you have ice cream inside someything but lots of heat on outside+ latent heat delays the heat flow you can ahve ice ,water and steam in same bucket if you add alot of heat quickly and the electric element will heat from one end not evenly through out the medium

yes wire them in a cascade arrangement,like solar thermal buffer tanks triggered by the requirement for a unit to go below 50% charge before swopping to next unit ,that way you can use your PV could you not?.or maybe have a divertor valve when excess PV to make it run UFH heating to drop it into charge zone ,then divert back while its charging--alot of buggering about i know but a solution to use what you got to best . Is the real problem one of cycles --most lithium batteries have a maximum number of cycle you can use them for --maybe all these little charges have same effect long term and would reduce full capacity life span

the obvious answer is send them a link to this thread and then the make their own decision

so what you are saying is it should never have been released then ,but they have made the pcm case thinner than the first one from what i read . there should be no swelling of the pcm case -so they have made it too thin--any way its basically not fit for purpose - and if you remember i said this very early on when i referred to "tombstone technology " as they called it in the aero industry -i,ll revisit this thread in a years time and see what they are like then once production is moved to china !!.which it will be , nothing more certain.

so that comes back to what i said before "bean counters"--they ALWAYS FXXX engineers designs

I understand what you say --but that is even worse really in some ways- it means no one of technical knowledge oversaw the drawings for final production line build spec. and you say the new one is still over packed,as you show by pointing out the witness marks of wiring -so who is listening at sunamp?

20k fine will be cheaper than finding a replacement tree of same dimensions and importing it from usa they knew what they were doing -- If they could stop the building works until they replace it AND give them the fines as well ,cos the fine is for cutting it down that might make something happen --but we all know it won,t 40 houses that only £500 per house --nothing could be 10K of wood in that as well?

sounds just like d&g council . you get planning ,but then all the details of the build have to cleared by building control ,as you also have to get a permit from them and they are the ones that do all site inspections. you send your plans to building control and then there are a dozen things that they don,t like ,even though planning passed it,all planning do really is "pass" it in principle.then building control comes takes over I know cos i,ve had some problems like that with them I can understand them not wanting you to connect to a victorian cast water main --digging it up+drilling holes in it etc could just make more fragile +they don,t want to replace it any time soon check and double check on everything that requires "imperial authority " and get in in writing --been caught like that as well

I hope you are right. but they need to be made aware in no uncertain terms that these sort of problems will not be tolerated, the idea that a bit of case deformation is ok and people need to live with it is just nonsense. my architect friend who is refurbishing a castle with its own hydro scheme , and when i linked him to the sunamp site was very keen ,as he would need 10+ units --he will not be very keen when I forward these forum postings on to him

the way brexit is going--I hope - hold off buying property till after march --£ could crash and everything will be cheaper then and all those too stretched with loans will need to move things quick . cash is always king if that happens

so just another quality british made product then. like i said last week "bean counters " trying to cut corners

its looks pretty certain that you have found the reason for panels bulging --pcm stuff is getting over hot and expanding more than designed too.