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Discuss Why would this be fitted??? in the Renewable Energy area at

  1. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

  2. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Hi by the way sorry it’s been a long day
  3. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    I'm guessing someone got sold a lemon / standard gd bull crap
  4. Chester

    Chester Member

    Heat time of 6hours wtf am I looking at? Maybe some kind of government grant?
  5. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Well that’s my logic. It’s in a newly refurbished property and I can’t see the reasoning for such a spec. It’s an old house that’s been modernised. Just can’t put my finger on it
    • Winner Winner x 1
  6. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Yeah could be a grant I suppose I’m meeting the current owner tomorrow so I’ll ask I just wanted to see if anyone had any logical reasoning
  7. quality

    quality Plumber GSR

    They do work very and very efficiently the heat time is from a full tank of cold water but the annoying thing is every time you run any more than 2-3 liters of hot water it operates to top the temperature up. Have a quick google at the refrigerant used lol
  8. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Are they super efficient?? I was just trying to fathom why, when you’ve fitted a gas boiler would you go for this type of water heating set up. I’m not very familiar with them as you can tell. I see Dimplex though and I get a cold shiver down my spine
  9. oz-plumber

    oz-plumber Plumber

    In real terms, because someone selling the product was on some huge bonus scheme for each product sold.

    In reality, due to the refrigerant process, 1 kW of electricity was transferred into @ 3 kW of heating capacity. This would show a customer that they are @ 300% efficient. ( COP )
    And the cost saving would have been displayed to the customer on those terms.
    In depth reality, the heating by the refrigerant would only heat the cylinder to 45C and a booster element would be operated to heat the water another 20C to 65C ( COP - 0.6 -0.8 ) - not found in any documentation.

    We have installed numerous units of this type over the years to replace electric hot water units - for a supposed cost saving to the customer on running costs.

    My consensus on these units are, if the refrigerant side of the unit breaks down with in the warranty period it will be worth fixing under warranty. If the refrigerant side of the unit breaks down outside the warranty period - throw the unit away because the cost of repairs would far outweigh the supposed saving on electricity use.

    I have no idea why you would install an electric storage heater on a property that had gas available.
  10. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Thanks everyone I’m glad you share my thoughts
  11. bacon_sandwich

    bacon_sandwich GSR

    Bizarre really, my advice would be to turn it off, only use it if boiler breaks down, assuming cylinder has been piped to boiler
  12. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    No it’s not. It’s a stand alone direct air source water heater. So switch it off no hot water. Boiler is a heat only for the CH
  13. Chuck

    Chuck Well-Known Member

    My first guess is that whoever refurbished the building was aiming for Part L BR compliance based on a whole building calculation but it turned out short. So they installed one of these as a way to drive down the CO2 input figure.

    IMO, the economics of this type of gadget is at best marginal when comparing (gas bill+maintenance) vs (leccy bill+maintenance). You need some other reason (subsidy, grant, BR compliance, green ideology) to tip the balance.
  14. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Well this is my take entirely. If you’re going for the green option then you have to be seen to improve insulation and general property energy efficiency. This is a 50-60 year old property so you’d have to go gung-ho in terms of improving heat retention and the general heat loss factors of the property. This one has done none of this except throw in an air source cylinder. I wouldn’t even say it’s a great cylinder as it only has 5 year warranty on the cylinder and 2 years on the actual mechanics. Would just seem to be so many better options out there
  15. dan_the_plumber

    dan_the_plumber GSR

    Has the cylinder got an additional coil inside piped off the central heating circuit?
    Heat pumps generally only heat water to 55 degrees.
    In order to take the temperature up to the required 60-65 degrees, an emersion heater or additional coil is often used.
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