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Heat Pump Boiler manufactuers?

Chuck_17
Chuck_17 Member Posts: 131
I was watching a youtube video by a guy in Australia (I think) talking about the merits of heat pumps replacements for boilers. The way I understood it, it was for infloor heating (so relatively low temp) and had a buffer tank but was more or less a replacement for boilers. Residential.
Do you know some manufacturers marketing this in the USA?

I am familiar with several heat pump manufactures (air to air).
I am not talking about domestic hot water (but for bonus points - any information on a large commercial domestic water heaters that work in cold climate ....)



Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 9,176
    Everyone make heat pumps for hot water heating. Do your want air to water or water to water?
  • Jamie Hall
    Jamie Hall Member Posts: 16,063
    One wouldn't use the term "heat pump boiler". That said, there are, I believe, several manufacturers who make heat pump equipment which can be used for low temperature hydronic heating, either as air source to water or as ground source to water. Daikin is one, but there are others.

    Air to water heat pumps have, at least to date, not been suitable for use in colder climates -- say with design temperatures below about 10 Fahrenheit. Nor am I aware of any which are suitable for higher temperature hot water heating say about 130 or so), never mind steam. Ground source heat pumps, however, if properly sized, do function well in lower outdoor temperatures -- since they are largely independent of the outdoor air temperature. Again, however, they are so far as I am aware not suitable in systems requiring higher water temperatures or steam.

    I do know of one installation in a large academic setting in a cold climate, using ground source heat pumps and low temperature hot water. It was very expensive, as it required the complete removal and replacement of the heating in most of the older buildings, which had been steam or high temperature (180) hot water.

    I'm not sure what the largest air source heat pump hot water heaters are. I do know of at least one installation, using several commercially available units, which is in use in a resort hotel with about 200 rooms for domestic hot water. That particular installation does use gas fired hot water boosters, however, for the hot water for cleaning and dish washing and other sanitation needs.

    All that said, from the standpoint of the engineering and physics, is it possible to create such a system? Yes it is, although it may have two or more stages. It's purely a matter of choosing appropriate refrigerants and pressures and pressure ratios. Is it economically attractive? At this time, no.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Larry Weingarten
    Larry Weingarten Member Posts: 2,198
    Hi @Chuck_17 , Perhaps the attached will have something of interest.

    Yours, Larry
  • hot_rod
    hot_rod Member Posts: 14,808
    air to water heat pumps are becoming a viable option. They certainly can work in cold climates. Efficiency will drop some at lower outdoor conditions. Low temperature heat emitters will be a better choice. It's all in the numbers.
    https://idronics.caleffi.com/magazine/27-air-water-heat-pump-systems
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Steamhead
    Steamhead Member Posts: 14,564

    Hi @Chuck_17 , Perhaps the attached will have something of interest.

    Yours, Larry

    A brief glance through that uncovers some Code issues- like, hooking up all that electrical equipment to a 100-amp electrical service? That wouldn't fly in a lot of places...................
    All Steamed Up, Inc.
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
  • Jamie Hall
    Jamie Hall Member Posts: 16,063
    Steamhead said:

    Hi @Chuck_17 , Perhaps the attached will have something of interest.

    Yours, Larry

    A brief glance through that uncovers some Code issues- like, hooking up all that electrical equipment to a 100-amp electrical service? That wouldn't fly in a lot of places...................
    That is one of the minor problems...
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
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