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A2A vs A2W: Which Heat Pump Would You Pick? Poll is created on Nov 24, 2025

Air-to-Water

Air-to-Air

Not sure

Neither. Sticking with my boiler

A2A vs A2W: Which Heat Pump Would You Pick?

Mars · 2025-11-24T22:55:47Z

It’s looking increasingly likely that air-to-air heat pumps (essentially AC units used for heating) may soon qualify for a £2,500 Boiler Upgrade Scheme grant. That means homeowners could soon have two subsidised options: Air-to-Water (ASHP) with the current £7,500 grant Air-to-Air (A2A) with a proposed £2,500 grant Each route has pros and cons: installation cost, comfort, efficiency, hot water, running costs, and complexity all differ. So the big question for homeowners is, if both were subsidised, which would you install: A2W or A2A?

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Air Source Heat Pumps (ASHPs)

Last Post by ASHP-BOBBA 3 minutes ago

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ASHP-BOBBA

(@ashp-bobba)

Honorable Member Member Professional Installer

Joined: 1 year ago

Posts: 449

14/05/2026 9:14 pm

Posted by: @batpred

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Posted by: @temperature_gradient

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There's another technology option, sat between A2A and A2W which is a hybrid of both which looks quite attractive if it takes off and becomes more widely available - Panasonic have a system called Aquaria Loop, intended for apartments/large buildings, which uses in-room W2A units (powered with their own integral heat pump) that can provide both heating and cooling, which are connected to the building's wet pipework system with an outdoor unit, which maintains the loop at something around room temperature, above dew point to prevent condensation.

I missed this @temperature_gradient . I wonder if any other manufacturer has this as an add-on..

Mitsubishi have something called HVRF, this is their VRF with 2 main CH pumps feeding multiple fan coil units with water but acting like an AC system, they heat and cool, we have installed several of these and I must admit it is some of the best tech I have seen in the cross over DX market.

AAC Group Ltd covering the Kent Area for design, supply and installation of ASHP systems, service and maintenance, diagnostics and repairs.
Professional installer. Book a one-to-one consultation for pre- and post-installation advice, troubleshooting and system optimisation.

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djh

(@djh)

Active Member Member

Joined: 2 years ago

Posts: 18

14/05/2026 9:55 pm

@ashp-bobba that's a different idea. Look at the Panasonic system to see what it does.

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ASHP-BOBBA

(@ashp-bobba)

Honorable Member Member Professional Installer

Joined: 1 year ago

Posts: 449

14/05/2026 10:28 pm

@djh ah, I have never seen this before, interesting idea, so a central ASHP but a much lower loop temp then a local top up with mini units in each room. I like Panasonic, they do great commercial gear, I got a 70kW ASHP to do at the end of the year using Panasonic.

It great being in an industry that is evolving thats for sure.