Robur Gas Absorption
Heat Pumps & Chillers
ICA Heating supplies and services the full Robur product line across New Jersey and New York. Gas absorption heat pumps that exceed 170% efficiency. Chillers that cut electric demand by 87%. Natural ammonia refrigerant with zero global warming potential. Engineered for the buildings we serve every day.
Gas-Driven Heating & Cooling
That Changes the Math
Robur Corporation, based in Evansville, Indiana, manufactures gas absorption heat pumps and chillers that fundamentally change the economics of commercial HVAC. By replacing electric compressors with a gas-fired ammonia-water absorption cycle, Robur systems deliver heating efficiencies above 170% and cooling with 87% less electricity than conventional equipment.
For facilities in NJ and NY — where electricity is expensive, electrical capacity is often constrained, and peak demand charges are punishing — Robur offers a compelling alternative. Single-phase power. No large electrical infrastructure. No F-Gas-regulated refrigerants. And heating performance that actually improves your energy economics instead of just shifting fuel costs.
ICA Heating carries the full Robur line — GAHP Plus heat pumps in air-source, water-source, and geothermal configurations, plus the complete GA ACF chiller family including heat recovery, high-ambient, and low-ambient models.
Gas Absorption Heat Pumps
That Exceed 100% Efficiency
Robur GAHP Plus heat pumps combine gas combustion with renewable energy from air, ground, or water — delivering heating output that exceeds fuel input. Every model uses ammonia refrigerant and runs on single-phase power.
The flagship Robur gas absorption heat pump. Extracts renewable thermal energy from outdoor air and combines it with high-efficiency gas combustion to deliver heating output that exceeds fuel input — achieving a Gas Utilization Efficiency of up to 172%.
- Capacity120,000 BTU/h heating
- GUEUp to 172%
- Modulation28% to 100%
- DHW TempUp to 158°F
- Ambient Range-22°F to 113°F
- RefrigerantAmmonia (GWP = 0)
- ElectricalSingle-phase, 230V/60Hz
Reversible gas absorption heat pump that provides both heating and cooling from a single unit. In cooling mode, it replaces electric chillers with gas-driven absorption — cutting electrical demand by up to 86% while delivering reliable comfort year-round.
- Heating120,000 BTU/h
- Cooling60,500 BTU/h
- GUEUp to 154% heating
- Modulation46% to 100%
- Chilled WaterDown to 44.6°F
- RefrigerantAmmonia (GWP = 0)
- ElectricalSingle-phase, 230V/60Hz
Water-source gas absorption heat pump that extracts energy from groundwater, cooling tower water, or process water loops. Delivers the highest efficiency in the GAHP line at 174% GUE with the ability to produce simultaneous hot and chilled water.
- GUEUp to 174% heating
- Total EfficiencyUp to 248% (simultaneous)
- Modulation28% to 100%
- SimultaneousHot + chilled water
- RefrigerantAmmonia (GWP = 0)
- ElectricalSingle-phase, 230V/60Hz
Ground-source gas absorption heat pump that pairs with geothermal bore fields. Robur's absorption cycle extracts more energy per foot of bore than electric geothermal — reducing bore field size by up to 50% while delivering 165% GUE.
- GUEUp to 165% heating
- Bore ReductionUp to 50% fewer probes
- Modulation28% to 100%
- RefrigerantAmmonia (GWP = 0)
- ElectricalSingle-phase, 230V/60Hz
Gas Absorption Chillers
87% Less Electricity
Robur GA ACF chillers replace the electric compressor with gas-fired absorption cooling. Single-phase power, no large electrical infrastructure, and up to 87% reduction in electrical consumption compared to conventional chillers.
The core Robur gas absorption chiller for standard commercial cooling applications. Delivers 60,500 BTU/h cooling with up to 87% less electricity than conventional electric chillers — running on single-phase power with no large electrical infrastructure required.
- Cooling60,500 BTU/h (5 tons)
- Min Water37.4°F outlet
- Ambient32°F to 120°F
- Electric SavingsUp to 87%
- ElectricalSingle-phase, 230V/60Hz
Gas absorption chiller that simultaneously produces chilled water and recovers 86,400 BTU/h of usable heat at up to 176°F — ideal for facilities that need cooling and domestic hot water or reheat at the same time.
- Cooling60,500 BTU/h (5 tons)
- Heat Recovery86,400 BTU/h at 176°F
- Min Water37.4°F outlet
- Ambient32°F to 120°F
- ElectricalSingle-phase, 230V/60Hz
Engineered for extreme outdoor temperatures up to 131°F. Where electric chillers lose capacity and efficiency in high ambient conditions, the GA ACF HT maintains reliable cooling output without performance degradation.
- Cooling58,400 BTU/h
- Min Water41°F outlet
- Ambient32°F to 131°F
- Electric SavingsUp to 88%
- ElectricalSingle-phase, 230V/60Hz
Designed for year-round cooling in cold climates — operating in ambient temperatures as low as 10.4°F. Ideal for data centers, process cooling, and facilities that require chilled water even during winter months.
- Cooling60,500 BTU/h (5 tons)
- Min Water37.4°F outlet
- Ambient10.4°F to 120°F
- Electric SavingsUp to 88%
- ElectricalSingle-phase, 230V/60Hz
Why Gas Absorption.
Why Robur. Why Now.
The engineering and economic advantages that make Robur gas absorption systems the smart choice for commercial heating and cooling in NJ and NY.
Where ICA Installs
Robur Systems
ICA has designed and installed Robur gas absorption systems for facilities across New Jersey and New York — from hospital campuses to hotel properties.
Your Robur Partner
in NJ & NY
Gas absorption technology is different from conventional HVAC — and it requires a partner who understands both the equipment and the applications. ICA Heating has been engineering commercial heating and cooling systems since 1974. We know the buildings, the codes, and the utility conditions across our territory.
When you buy Robur through ICA, you get more than equipment. You get a team that designs the system, installs the equipment, commissions every module, and stays with the installation for its entire lifecycle. One call. One relationship.
Common Questions About
Robur & Gas Absorption
for Your Next Project?