HP40 Gas Absorption Heat Pump: Right‑Sized 37,400 BTU Solution for 1,500–2,500 sq ft Homes
Introducing the HP40 Gas Absorption Heat Pump, the newest addition to our high‑efficiency heating lineup and a perfectly sized alternative to the larger HP80. Designed specifically for homes and small commercial spaces between 1,500 and 2,500 square feet, the HP40 delivers an optimized 37,400 BTU/hr output—ideal for matching the real‑world heating loads of these environments. By right‑sizing performance to the application, the HP40 eliminates the short‑cycling issues that can occur when oversized equipment like the HP80 is installed, ensuring longer run times, greater efficiency, and improved comfort. Compact, reliable, and thoughtfully engineered, the HP40 brings all the advantages of gas absorption technology in a format perfectly matched to mid‑sized spaces.
- Available in 40K and 80K heat-only models
- Ultra-high efficiency lowers gas use up to 50% and reduces CO2 emissions
- Comfortable space heating down to -40° F/C without need for backup
- Variable speed evaporator fan and modulated burner optimize efficiency
- Sealed system contains a natural refrigerant (R717) with zero global warming potential (GWP), zero ozone depletion potential (ODP), and no PFAS
- Ultra-Low NOx compliant, environmentally-friendly gas burner
- Uses existing 120V / 15A circuits
- Remote system monitoring for building owners and installation professionals
- Rear water and gas connections with built in isolation valves
- Steel base with built-in fork pockets for easy transport & installation
Anesi HP80 Gas Absorption Heat Pump
Where Can You Use the Anesi Gas Heat Pump?
Engineered for HVAC professionals seeking advanced heating solutions, the Anesi gas heat pump delivers high-efficiency performance across residential, multi-family, and commercial applications. Its air-to-water absorption technology ensures reliable operation in cold climates, making it ideal for both retrofits and new builds. With ultra-low NOx emissions and zero GWP refrigerants, the system meets evolving environmental standards while offering flexible installation options and reduced operating costs—perfect for contractors focused on sustainability and long-term value.
Specifications
| Technical Data | Unit | 80K | 40K |
|---|---|---|---|
| Heating Capacity* | BTU/h / kW | 78,000/22.8 | 37,000/11 |
| CoP (Higher Heating Value)* | 1.43 | 1.35 | |
| Max Return Temp (at full fire) | ° F/C | 132/55.6 | 132/55.6 |
| Max Return Temp (at min fire) | ° F/C | 142/61.1 | 142/61.1 |
| Delta T (at full fire) | ° F/C | 20/6.7 | 20/11 |
| Gas Input (Higher Heating Value) | BTU/h /kW | 54,500/16 | 27,400/8 |
| Modulation (fully variable) | 4:1 | 3.4:1 | |
| Combustion | Condensing/Premix | Condensing/Premix | |
| NOx Compliance (Ultra-Low NOx) | ng/J | <14 | <14 |
| Nominal Hydronic Flow | gpm/lpm | 8.5/30 | 4.3/16.3 |
| Hydronic Pressure Drop (Nominal Condition) | psi/kPa | 5/34.5 | 2/14 |
| Glycol Concentration** | % | 40 | 40 |
| Ambient Temp (min—max) | ° F/C | -40 to 130/-40 to 54 | -40 to 130/-40 to 54 |
| Voltage | VAC | 115 | 115 |
| Maximum Power | Amp | 6 | 4 |
| Length | in/cm | 48/121.9 | 48/121.9 |
| Width | in/cm | 34/86.4 | 32.5/82.6 |
| Height || Height with Flue | in/cm | 45.2/114.8 || 56.5/143.5 | 39/99 || 49/124.5 |
| Weight | lbs/kg | 550/249.5 | 460/209 |
| Hydronic Connection FNPT – dia | in | 1 | 0.75 |
| Gas Connections FNPT – dia | in | 0.5 | 0.5 |
| Electrical Knockouts (x2) – dia | in | 0.875 | 0.875 |
| Refrigerant | R717 | R717 | |
| CTA2045 Compliance | Future release | Future release | |
| Communications Capabilities | MODBUS, Cellular | MODBUS, Cellular | |
| Certification | ETL per ANSI Z21.40.1/CGA 2.91 | ETL per ANSI Z21.40.1/CGA 2.91 |
**Most installations