Commercial Water Heating with Anesi Gas Heat Pumps
Maintaining an adequate hot water supply in your business can be a significant operating expense and nearly always an equally significant capital expense when considering new installation or replacement. For commercial water heating with gas, an opportunity to lower operational costs by reducing natural or LP gas use and protect the environment makes the Anesi® Commercial Water Heating Solution the best option on the market.
The Anesi model HP80 gas absorption heat pump (GAHP) combines the reliability and effectiveness of a gas appliance with the efficiency of air-to-water heat pump technology. This combination yields an efficient and affordable gas water heater capable of a Coefficient of Performance (CoP) of 1.40. The Anesi gas heat pump’s high efficiency and natural refrigerant allow business owners to demonstrate environmental responsibility with a product that conserves gas and reduces CO2 emissions, with zero ozone depletion potential (ODP), zero global warming potential (GWP), and no per- and polyfluoroalkyl substances (PFAS).
- 20-35% lower heating cost
- Reduces the impending financial impact of the higher cost of RNG and hydrogen
- Decreases the scale of massive electric grid expansion and storage for society
- Clear and logical installation
What does the Anesi system look like?
The Anesi system delivers high-efficiency water heating by combining one or more HP80 air-to-water heat pumps (installed outdoors) with one or more indoor storage tanks (ISTs)—typically 100 to 119 gallons in capacity—connected via a hydronic loop.
For low-demand applications (under 750 gallons of hot water per day), a single HP80 paired with a 119-gallon IST can often meet 100% of the daily hot water needs, depending on usage patterns. Retaining the existing water heater ensures redundancy and coverage during unexpected peak draws.
For higher-demand applications (over 750 gallons/day), a baseload/peak-load configuration is recommended. In this setup, the HP80 handles the baseload, while the legacy water heater (gas-fired tank or tankless) covers peak demand. This approach also provides system redundancy during maintenance or downtime.
Scalable Hot Water Solutions for High-Demand Applications
For systems requiring over 5,000 gallons of hot water per day, multiple HP80 heat pumps can be hydronically manifolded to increase capacity. Storage options include either multiple indoor storage tanks (ISTs) or a single large tank, depending on space and design preferences.
When using multiple ISTs, plumbing them in parallel—for both cold water inlets and hot water outlets—ensures maximum efficiency and consistent hot water delivery. As shown in the adjacent figure, the recirculation return enters one of the ISTs at the vertical midpoint, helping maintain temperature stratification.
Alternatively, the recirculation return can be routed to the line between the ISTs and the peaker units. A plate heat exchanger (PHX) is also shown between the heat pumps and ISTs, offering a flexible alternative to tanks with built-in heat exchangers.
Anesi Components for Commercial Water Heating
HP80
Gas Heat Pump
What applications best fit the Anesi system?
For applications where the GAHP is in a base load/peak load
situation, the more water that the GAHP heats versus the legacy condensing gas tank or tankless water heater, the greater the savings and decarbonization. Additionally, reducing demand
on the legacy system may result in less wear and tear, lower
maintenance, and an extended product lifetime.
- Restaurants
- Hotels
- Laundromats
- Car Wash
- Assisted Living
- Dormitory
- Multifamily Housing
Read more about real installations of Anesi GAHP within the restaurant industry.
Remote Monitoring
The Anesi GAHP can be monitored remotely to provide data on performance and potential service needs, enabling your installation professional and Anesi to work together to resolve any difficulties. Anticipating problems before they happen and responding proactively is a key feature that makes life easier and lowers costs for you and your installation professional.
How to Buy Anesi Products
Anesi products are available through HVAC distributors and installation professionals within the USA and Canada.
Contact us for more detailed information about Anesi products and availability.