Air-to-Water Heat Pumps
Quiet hydronic comfort with excellent efficiency — pairs perfectly with radiant floors and radiators.
How an air-to-water heat pump works
Instead of burning fuel to make heat, heat pumps move heat from outdoor air into water using a refrigeration cycle. That heated water feeds radiant floors, radiators, or hydronic fan coils. Because they move heat rather than create it, they can deliver multiple units of heat for each unit of electricity used (a high COP).
- Low-temperature operation: Ideal for radiant systems and modern low-temp radiators.
- Domestic hot water (DHW): Can pre-heat/storage tank for hot water production.
- Hybrid options: Works alongside an existing boiler for cold-snap backup (bivalent design).
Why air-to-water is so efficient
Heat pumps typically deliver 2–4× more heat energy than the electrical energy they consume (Coefficient of Performance), especially with low water temperatures.
Radiant floors and low-temp radiators run at 30–50 °C supply—exactly where heat pumps are most efficient.
Room-by-room controls maintain steady temperatures without drafts or noise.
Go fully electric or combine with a boiler for a best-of-both approach and resilience in extreme weather.
Moving heat is cheaper than making it. Many homes see lower utility bills compared to straight electric or older fossil systems.
No combustion in the home; minimal noise and no duct dust recirculation.
How heat pumps compare to other systems
| Feature | Air-to-Water Heat Pump | Condensing Gas Boiler | Forced-Air Heat Pump (air-to-air) |
|---|---|---|---|
| Efficiency | High COP, best at low water temps | High (when return temps kept low) | High SEER/HSPF; depends on duct losses |
| Comfort feel | Steady radiant warmth; quiet | Steady hydronic warmth; quiet | Blower-driven; faster swings, potential drafts |
| Air quality | Very low air movement; less dust | Very low air movement; less dust | Moves air/dust unless high-grade filtration used |
| Cooling | Needs separate cooling (fan-coils or ductless) | Needs separate cooling | Cooling built-in with same ductwork |
| Fuel type | Electric | Natural gas/propane | Electric |
| Best pairing | Radiant floors, low-temp radiators, buffer tanks | Radiant floors/radiators, DHW | Ducts, high-efficiency filtration, zoning add-ons |
We’ll help you weigh comfort, operating cost, and project scope to choose the right approach.
Design options & applications
- Radiant floors (slab, over-floor panels, staple-up) and low-temp radiators.
- Hydronic fan-coils for quick response and optional cooling when paired with a chiller module.
- Buffer tank for stable operation and zoning; smart mixing to match floor temperatures.
- DHW integration via indirect tank or pre-heat loop.
- Hybrid (bivalent) setups with boilers for extreme cold resilience.
Our process
- Site visit & heat-loss discussion
- System design (emitters, buffer, controls, bivalent point)
- Professional installation & commissioning
- Walkthrough, documentation, and maintenance plan
Good to know
- Best efficiency at lower water temps (e.g., 30–50 °C supplies)
- Electrical capacity and outdoor clearances are checked before install
- Works beautifully with our hydronic / in-floor systems
Membership & maintenance
Join our Eggert Energy Service Club for annual checkups, priority scheduling, and member perks.
Air-to-water heat pump — FAQ
Can a heat pump replace my boiler?
Will it work with my existing radiators?
What about cooling?
Do you handle maintenance?
Keep your home comfortable year-round
Join the Eggert Energy Service Club for annual tune-ups, priority scheduling, and exclusive member perks that give you peace of mind.
Curious if an air-to-water heat pump fits your home?
We’ll compare options, expected efficiency, and give you a clear, no-pressure quote.
📝 Request a Consultation