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
- 2,171 Topics
- 47.8 K Posts
- 32 Online
- 5,744 Members
Join Us!
Podcast Picks
Latest Posts
-
RE: Powerwall 3 or Myenergi or something else?
Many of those tariffs are simple time of use tariffs, w...
By Temperature_Gradient , 2 hours ago
-
RE: Help me keep the faith with my air source heat pump installation
Yes thats the whole point of the flexis as regards tran...
By JamesPa , 2 hours ago
-
So far as I can tell designing for DT5, which is 'the n...
By JamesPa , 2 hours ago
-
Mitsu PAR-WT60R Wireless Controller - options
I hope I have satisfactorily installed the above wirele...
By DavidAlgarve , 4 hours ago
-
WC curve best discovered by experiment anyway as any lo...
By JamesPa , 9 hours ago
-
RE: Big Changes Coming to Our Heat Pump System
@editor your engineer's attitude is truly horrifying. ...
By GrahamF , 1 day ago
-
RE: How to choose Towel Rails for an ASHP
@rob-nezard yes absolutely. Here is the link and a pho...
By GrahamF , 1 day ago
-
@mixergy Thanks for the update, I would appreciate some...
By bontwoody , 1 day ago
-
RE: Is Your Broadband Router the Weak Link in Your High-Tech Home?
Unfortunately I'm not that well connected 😂 ...
By Scalextrix , 1 day ago
-
RE: A Customer's Lessons Learnt from a Heat Pump Installation in a Large House
It is interesting to see what our new Grant Aerona 290 ...
By GrahamF , 1 day ago
-
RE: Testing new controls/monitoring for Midea Clone ASHP
I've never physically seen it, but I seem to recall som...
By cathodeRay , 1 day ago
-
RE: Midea ASHP – how to set weather compensation
I noticed that too and thought the same thing, but then...
By cathodeRay , 2 days ago
-
RE: Ya can’t win! It is S*d’s Law!
@old_scientist If IOF is still running next late spring...
By Toodles , 2 days ago
-
RE: Electricity price predictions
Those of you on Agile will do well tomorrow; there are ...
By Toodles , 2 days ago
-
RE: Who’s Caved and Switched the Heating On Already?
We've been running our Ecodan system, installed in June...
By Sheriff Fatman , 2 days ago
-
Ok. Two schools of thought. The first is to run the ...
By JamesPa , 3 days ago
-
@drei Willing as I am to help, I don't think I'm yet ...
By JamesPa , 3 days ago
-
Selling 5 year old ASHP & Gas Combi Boiler - £590
Selling a 5-year-old Daikin Altherma Hybrid Air Source ...
By Paul G , 3 days ago
-
RE: Is a Valliant Inline 6kW heater a BUS buster?
Much of that is true in principle, but its not likely t...
By JamesPa , 5 days ago