Digital Showers and lower temperature hot water
Hi
I am in the process of getting a heat pump. At present I have a Mira Platinum low pressure pumped digital shower, and assumed all I had to do was replace it with the high pressure version. When looking at this option I read the spec for the unit which stated the hot water operating temp. range was 55-65 degrees. As I want to store water in the range 48-50 degrees I emailed Mira customer services to ask if it would work ok.
The reply was vague, offhand and unhelpful "Don't know we haven't tested it at that temp, may work my not or not work as well as it could/should, any issues will invalidate your warranty" so not a lot of help there.
Any heat pump owner using something similar, does it work ok, I assumed anyone using a combi gas boiler would not be heating water to around 60 degrees so it should work?
I had a Aqualisa digital pumped shower prior to having the ASHP installed’. It had to be stripped out because the ASHP system is a closed mains pressure system and consequently cannot have a pumped/power shower. Swapped it for a non pumped shower.
Retrofitted 11.2kw Mitsubishi Ecodan to new radiators commissioned November 2021.
14 x 500w Monocrystalline solar panels.
2 ESS Smile G3 10.1 batteries.
ESS Smile G3 5kw inverter.
Surely you could keep a vented DHW cylinder and existing cold water tanks. Also, why can't the ASHP primaries have a header tank like my gas central heating system?
That may be possible, I don,t know but why would you want the worst of both worlds? poor hot water pressure to taps & showers especially upstairs with a big imbalance between mains pressure cold and gravity fed hot and a pair of tanks sitting in the attic, when you can have high pressure hot & cold supply and a large tank of stored water?
@somerpark Mains water pressure isn’t necessarily high pressure. Minimum service level is around 1 bar. It may not be the case that there is a large pressure imbalance between hot and cold supplies. A pumped thermostatic shower overcomes these issues and it is likely that it would be incompatible with an unvented cylinder.
@ianmk13 I though mains pressure of 1 bar and above was considered high pressure. and I have been using a pumped digital shower because I have a vented DHW cylinder at present with the associated cold tank and CH header tank in the attic. The pump only overcomes the issue with the shower, my upstairs bathroom hot tap has a 2 metre head, 0.2 bar and my cold tap is mains pressure in my case about 1.5 bar. The heat pump as far as I know only works with an unvented cylinder at mains pressure so it is not an option to stick with my current setup which I would not choose for my situation if it was possible. So the pumped shower has to go.
Posted by: @somerparkHi Did you swap it for a another digital unit and is it working ok?
No. I swapped it for a non-digital, unpumped shower, and the cold water storage tank was removed. A power shower is not compatible with an unvented closed system. (As explained by my installer.)
Retrofitted 11.2kw Mitsubishi Ecodan to new radiators commissioned November 2021.
14 x 500w Monocrystalline solar panels.
2 ESS Smile G3 10.1 batteries.
ESS Smile G3 5kw inverter.
Posted by: @ianmk13Surely you could keep a vented DHW cylinder and existing cold water tanks. Also, why can't the ASHP primaries have a header tank like my gas central heating system?
How will you heat the water in the retained vented DHW cylinder? Because you won't be using the ASHP.
Retrofitted 11.2kw Mitsubishi Ecodan to new radiators commissioned November 2021.
14 x 500w Monocrystalline solar panels.
2 ESS Smile G3 10.1 batteries.
ESS Smile G3 5kw inverter.
- 26 Forums
- 2,152 Topics
- 47.2 K Posts
- 41 Online
- 5,671 Members
Join Us!
Podcast Picks
Latest Posts
-
RE: is a home battery without an EV worth it?
In fairness when the grant went from £5000 to £7500, wh...
By JamesPa , 59 minutes ago
-
@mars That response surely deserves a nomination for Tu...
By JamesPa , 1 hour ago
-
RE: Midea ASHP – how to set weather compensation
@pash44pump lots of good advice from others on tests, o...
By JamesPa , 3 hours ago
-
Specifying batteries, pv solar etc using ChatGPT
I thought I'd try to use ChatGPT to specify my requirem...
By Tim441 , 3 hours ago
-
RE: Electricity price predictions
@diverted-energy I totally agree, but a regulated minim...
By Old_Scientist , 3 hours ago
-
RE: Octopus tariffs - a quick comparison
For our set-up, Octopus GO has been the best option fro...
By ChandyKris , 6 hours ago
-
RE: Ecodan & MelCloud scheduling
When I interviewed Mitsubishi Electric at Installer ear...
By Mars , 8 hours ago
-
RE: Rodents! A word of warning for heat pump owners
@lucia One look at that protection and the rodents will...
By Toodles , 8 hours ago
-
RE: What crazy nonsense are inverter limits and why are they imposed?
@transparent The only reason my DNO knows of these is b...
By Lucia , 13 hours ago
-
RE: A Customer's Lessons Learnt from a Heat Pump Installation in a Large House
🙁🙁🙁🙁🙁
By Lucia , 13 hours ago
-
What is the Heat Geek Guarantee?
We regularly hear from homeowners who are researching i...
By Mars , 1 day ago
-
RE: Help me keep the faith with my air source heat pump installation
@adamk, interesting point. I’ve not focused much on Hea...
By Mars , 14 hours ago
-
Intelligent Octopus Flux (IOF) Review
I promised @toodles that I would provide an update and ...
By Old_Scientist , 1 day ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
@julianc Our solar PV has produced more this August tha...
By Toodles , 1 day ago
-
RE: Who's your electricity provider and what's your tariff?
I am pleased to see the change. We definitely need t...
By Jeff , 2 days ago
-
RE: How Do I Know When the Hot Water Has Run Out?
@transparent that is a very interesting suggestion, tha...
By GrahamF , 3 days ago
-
RE: The good, the bad and the not that great – my heat pump installation
Sorry to resurrect this thread, but it is sort of relev...
By cathodeRay , 3 days ago
-
RE: Getting the best out of a heat pump - is Homely a possible answer?
I missed your 22nd June post on this. I am sure it can ...
By cathodeRay , 4 days ago
-
Now posting on the right topic.... With general build...
By benson , 4 days ago