"Selling out quicker than your new Government!" Nice one 😃

Nice one again, good to see the cooperation of you and Adam, both geeks 👍

In Germany this kind of inverted water store is called "Frischwasserspeicher" in case anyone is looking to by something in Germany. OEG produces insanely well insulated variants.

We've had our 250l Heatgeek cylinder in for nearly 3 months and are averaging a CoP of 4.7 for dhw only.
I might add, that's at night during our cheap electric period,  so it's costing about 10p/day to heat.
Couldnt be happier.

60 minutes - 1 hour! Marie would make a great news presenter lol.

Great video, great products. Thanks.

Friday testing late in the day gives me anxiety 😂press fittings definitely make it less stressful 😊

Interesting. We are having a heat pump system installed to run alongside solar water heating, and they have fitted the new Cordivar PDC system. Rather than two coils for solar and heat pump, it has one for the solar hot water, but on the top of the cylinder is a small set-up with a heat exchanger, small pump and a piping circuit that heats the domestic water from the heat pump -  based on the stratification theory that you talk about.  It seems that there are changes afoot in the world of DHW tanks!.

given the coil is extended to the lower,  is there any replacement annode so it doesn't corrode to match many old coppers that run 20 years plus?

I wish you would come to me. I paid for the survey 3 weeks ago and was told 2 weeks later we can't survey your property because there are no heat geeks in your area and you need to wait until somebody gets trained up.

I can't believe you bought a smoke machine just for Adam's entrance.

During the colder weather I have the heat pump set to 28 degrees, which works fine on the house temperature and hot water combined. This new cylinder works more efficiently due to the larger surface area of heat transfer, during the summer months would it be more cost effective and efficient to increase the flow temperature to heat the domestic hot water, allowing the heat transfer to the tank to increase using the warmer outside ambient temperature to reduce running times or power consumption

For those of us with combi's what would be a game changer is a super efficient cylinder in the shape of a combi boiler which can be wall hung.

Good to see you're fettling your home setup. The mark of a good engineer is to be interested in how things are performing and tweaking them. I am not sure experimenting with the shower's hot water supply is the mark of a good husband, but she no doubt knew you were a heating geek!
Delta-T of 25 degrees, 200 litres, perhaps 7kW power from the heat pump (I think the Arotherm Plus has plenty of oomph on a summer's day) = 1 hour or thereabouts. As for COP ... I would hope for something north of 4, given it is warm outside and SCOPs for 45 degree design temperature heating are around this level.

You guys atr amazing, thank you so much 😎

Thanks

Great video and improvements! Have you also seen/tested any indirectly heated hot water cylinders? Itho Daalderop has some, the 'I-WPV 3G' series. It's really compact due to a lack of coil inside. It heats by pumping the water inside through a plate heat exchanger in it's base, where it's gets heated by the heatpump. Running one for about three months now and really impressed by it's performance :)

Finally, someone actually reviewed these!

Hi, I'm curious how much double spiral is important? I've found (Poland) producer that makes similar tank with 3,11m2 coil in the bottom part of 200l tank.  It's single, not double coil, but the price is really good (like 40% cheaper than joule). Do you think does it make sense to go extra mile for joule? I plan to install 4/5kW heat pump (3,5kW heat loss).

This is really interesting as I've yet to fit a heat geek cylinder, for a heat pump it's a no brainer as long as the cost is comparable with a manufactures own or Mixergy which are the ones that come up in conversations with customers most.