eniacs

From what i can see, the smaller coil will still work, but not acceptably. The coil can put in 4kw ish. So given the HP is 8.5kw and the tank 300L means it will take twice as long to heat. I've apologised to the seller and asked to cancel... Looking for another tank now.

Nick, Thats what im wondering now. Maybe in their software they force the heat pump to produce max flow temp. Probably cheaper than manufacturing a whole new line of heating coils and minimal affect to the consumer, just slightly lower COP for the DHW. Edit - I've emailed toshiba tech help to confirm this. If this is the case I'll have to beg the ebay sellers forgiveness for wasting his time.

Appears to be a regular cylinder.

Details below. Seems crazy that a massive company could label their cylinder as "Heat pump" if its only got a regular tiny coil!

Indeed. I cant believe the size is correct. But what else could it be! Its still available to buy

Does anyone have a toshiba heat pump system with their hot water tank? I've won a 300L one on ebay and its called on the data plate a "Heat pump cylinder" however im trying to find the coil surface area, the only mention of surface area is 0.79m2 which seems very low for a heat pump. Im thinking that my 8kw heat pump will need to run at 50% to heat with this coil and it will take twice as long. Should I cancel?! Its a absolute bargain price and the right size for us i think.

Definitely. Just another tax on DIY.

Our UVC is going in a bedroom so I'm looking at getting it signed off by a plumber friend. If it was only me in the house i would be ignoring too...

Has anyone tried one of these cheapy ones? I could do with one for underneath the counters in my kitchen

Hi John, 100l/min is just where the graph had an easy line to compare... 8.5kw mitsubishi, it lists 24l/min as flow rate. Pipe run max maybe 12m to furthest rad. Good point, i actually only have 3 steel rads so if i changed those for alu wouldnt need a filter. I've got one now anyway. Got a 24l expansion tank and filling system. The mitsubishi doesnt have an internal pump Yes flexi hoses listed got some 28mm 500mm versions for £50 from ebay

Bob I doubt anyone will care in your local neighbourhood, and if anyone does care, they wont know its against planning. I will just be putting mine in the front garden and moving it if forced I think. I will disguise it a bit so it doesn't look so bad.

Nice diagram, ive not really worked to any diagram yet! What's the flow setter for? Why would you not just want full flow and turn the pump down if its too high? I've negated the isolation valves at the pump as i couldn't see the point in them. Surely these will only be used when the unit is replaced which hopefully isn't often. Also haven't got a automatic air vent, not sure if that's essential either, i usually just vent the radiator at the highest point.

Crispy where are you finding these parts for so cheaply - even the caleffi valves on ebay cost £75 each. You are also lucky to have such a cheap wiring centre - my mitsubishi has just cost me £750 I did manage to get the mag filter for £60 though, did you manage to get a "Heat pump filter" i had to send back the first one as it was too restrictive.

I am just coming up to installing the pump itself and the main piping. I have already done the radiators and all new piping to the UVC install point. I've ordered various parts and I am realising that some are restrictive, despite being 28mm entries, they heavily restrict flow. The Fernox 28mm sigma TF1 applied a 500mbar restriction to 100l/min flow whereas the heat pump version only restricts by 100mbar at the same flow. The filter i ordered was the wrong one so back it went. I've so far bought only standard parts: 3 way valve - honeywell 28mm - interior looks restrictive, however its only over a very small distance. Filter - heat pump version ordered - interior of non heat pump version was very restrictive quickly stepping down way below the ID of the 28mm pipe. Main pump - ordered the grundfos UPS3 15-50/65 i think. It is the one suggested on their site and appears to produce the required flow according to the datasheets of heat pump and the pump. Flexi pipe - ordered 28mm hoping this is ok Freeze valve - again ordered 28mm hoping this is ok. Am i missing anything, can anyone recommend better parts befor i cannot return them and find that they restrict flow too much!

HI Conor, Its possible it would be a better location once the extension is done, however its years away i think. Weve done a complete replumb inside of the heating system, all new fan coil radiators and large bore piping. No other refurb of the house at the moment, it was refreshed about 8 years ago so mostly ok.

HI Richard, Thanks for taking the time to help. The green arrows are a good place, but under a bedroom window there and would block the alley space between garage and house too much. The bins live there and we run a business from the garage so access is pretty important. Stock is often stored here too. Mounted on top of the roof or to the house wall would shade part of the solar panels fitted here. The yellow arrows to the right are a good spot, however only undesirable because of the long pipe run. Adding probably 2x 10m bits of pipe to be buried. I've ordered some black wrap to test wrap one of the steel panels. Possibly this will make it stick out less like a sore thumb... Im inclined to leave it and see how we get used to it. LIke you say with infrastructure, its necesary and usually ugly. Like the myriad of grey/green/black street boxes with various BT gear in and the huge poles they put up everywhere to hang wires from.

Ah a quick google and its been done befor: https://www.creative-solutions-direct.co.uk/blog/article/vinyl-wrap-for-total-renewable-solutions-air-source-heat-pump

Dan, this looks awesome. Did you paint it or wrap it? I think wrapping it in black would probably help. It stands out and looks like a giant fridge in white!

We are planning an extension that would encompass that space... Its also more of a hassle for the piping there i think

Checked, yes it may need planning. Crazy as whole of rear garden is filled with stuff preventing fitting in a sensible location. Side space is too restricted so leaving only the front. WIll be the same for 90% of the houses in the town i am in!

Directly in the middle of the window. Wife says looks better, no different in my opinion but here it is.

Thanks all some good points. Positioned by the window as there is a drain to the left so cannot place it in the middle of the blank spot otherwise yes that would have been perfect. Cannot go down the alley between garage and house as isnt space and we use it so it would constantly be in the way a bit. Inpositioned it just to the left of the window so it hides the pipes coming out of the wall to meet it, does that make sense? I could site directly under the window but pipes would then be visible.

She doesnt like the look of it in the front of the house. Location is really the only place around the house that is both easy to get piping and cabling to and also out of our way. Other heat pumps ive put in i have put wooden boxing around the case and a nice cedar shingle roof on. Not sure that would work here though. Has anyone done anything to hide them?

Not a bad price at all. Also rated for cooling and heating. They look to be more rebranded Innova units, the front panel and control panel are the same.

I am on the site to help me install my house heat pump, so it isnt up and running yet. The 12kw heat pump i already have is the pool heat pump, it is in itself a large buffer tank! We have a 28kwh battery and 9kw of solar so power during the 3 warmer seasons is no problem. In the heating season, the house can stay quite warm all day having been heated in the 4 hour octopus period. We also hope to be able to run the house heat pump for a few extra hours on cold days to top up the house temps. This last winter, we had no heat pump, all heating was via oil filled direct resistance radiators powered by the battery and the night time octopus go rates.