CompareFairlyAir to Water Heat Pump Comparison 2026
Our pick : Lennox Signature Series (94/100) · Cheapest : Mitsubishi Electric Hyper-Heating INVERTER · Best value : Mitsubishi Electric Hyper-Heating INVERTER
In short
This comparison covers 9 heat pumps across 12 criteria: Purchase Price, Annual Operating Cost, Installation Cost, Heating COP, Cooling EER, Heating Capacity. Lennox Signature Series comes first with 94/100, driven by Heating Capacity (100/100) and Cooling Capacity (100/100). Carrier Infinity Series follows at 92/100 and beats it on Purchase Price. The cheapest option is Mitsubishi Electric Hyper-Heating INVERTER. Sourced data: 8/9 options; the remaining values are estimates, flagged as such.
Comparison table
| Criterion | Lennox Signature Series | Carrier Infinity Series | Mitsubishi Electric Hyper-Heating INVERTER | Trane XV Series | Rheem EcoNet Enabled | Bosch Climate 5000i |
|---|---|---|---|---|---|---|
| Purchase Price (USD) | 4500 | 3500 | 3000 | 4000 | 3000 | 5800 |
| Annual Operating Cost (USD) | 720 | 730 | 750 | 770 | 760 | 780 |
| Installation Cost (USD) | 4300 | 4250 | 3800 | 4100 | 3900 | 4200 |
| Heating COP (ratio) | 4.7 | 4.8 | 4.5 | 4.5 | 4.4 | 4.6 |
| Cooling EER (Btu/Wh) | 12.8 | 12.2 | 11.0 | 11.5 | 11.8 | 12.0 |
| Heating Capacity (BTU/h) | 37000 | 36500 | 34000 | 35500 | 34500 | 35000 |
| Energy Efficiency Rating | Very High | High | High | High | Medium | High |
| Cooling Capacity (BTU/h) | 37000 | 36500 | 34000 | 35500 | 34500 | 35000 |
| Sound Level (dB) | 44 | 43 | 48 | 47 | 49 | 46 |
| Smart Features | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Warranty | 10 years (with extended options) | 10 years | 5 years | 10 years (with extended options) | 9 years (with extended options) | 5 years parts |
| Refrigerant Type | R410A | R410A | R410A | R410A | R410A | R410A |
Frequently asked questions
What is the best air to water heat pump in 2026?
The Lennox Signature Series is currently the top-rated air to water heat pump with a score of 94/100, followed closely by the Carrier Infinity Series.
How are air to water heat pumps compared on this site?
We compare air to water heat pumps based on Purchase Price, Annual Operating Cost, Installation Cost, Heating COP, Cooling EER, and Heating Capacity.
Is the air to water heat pump ranking sponsored?
No, our ranking is completely neutral and not influenced by any paid placements; all data is sourced and verifiable.
What are the main factors to consider when buying an air to water heat pump?
Key factors include purchase price, annual operating cost, installation cost, and performance metrics like Heating COP and Cooling EER.
Methodology and transparency
Ranking: options are sorted on measured, sourced criteria. No position is ever sold, and no advertiser pays to appear here.
Scope: this comparison is not exhaustive. It presents the options our sources document, not every offer on the market.
Earnings: some outbound links may be affiliate links that earn us a commission. This never affects the ranking, the scores or the data.
Data: every value is linked to its source and refreshed automatically; the collection date is shown.