Air-to-water heat pumps are an emerging product in the HVAC industry, using water to deliver heat instead of air. Air-to-water heat pumps combine the efficiency of heat pumps with the comfort and flexibility of hydronic heating. They use outdoor air to heat water that is then circulated through radiators, radiant floors, or other hydronic emitters, offering an all-electric alternative to fossil-fuel boilers.
According to the report, HVAC consultant Jon Harrod explains how these systems work, where they perform best, and why low water temperatures are key to maximizing efficiency. While A2W systems offer advantages such as quiet operation and zoning flexibility, they also have higher upfront costs, design complexity, and challenges of retrofitting older homes.
A2W heat pumps exchange heat with the outdoor air, just like air-to-air heat pumps. But inside the house, they circulate water to hydronic emitters, similar to those used with boilers and some types of ground-source systems. This technology is different from heat-pump water heaters, which extract heat from indoor air and store it in a tank of domestic hot water.
I’ve been an HVAC installer and project manager for the last 10 years. Most of the heat pumps I’ve seen during that time have been air-to-air systems. However, air-to-water heat pumps offer a new alternative for hydronic heating without the cost and requirements of ground-source heat pumps.
Related: Standardization Boosts 3D Printed Housing Market
The benefits of A2W systems include quiet operation and zoning flexibility. However, they also have higher upfront costs and design complexity, making them more challenging to install and maintain. Additionally, retrofitting older homes with A2W systems can be difficult due to the need for new piping and radiators.
In comparison to other heating systems, air-to-water heat pumps offer a unique combination of efficiency and comfort. They can provide both space heating and domestic hot water, making them a viable option for new construction and home renovation projects. However, their higher upfront costs and complexity may make them less appealing to some homeowners.
According to Jon Harrod, low water temperatures are key to maximizing the efficiency of A2W systems. By using lower water temperatures, homeowners can reduce their energy consumption and lower their utility bills. This can be achieved by using radiant floors or radiators, which can operate effectively at lower temperatures.
Air-to-water heat pumps are a viable option.