When a water heater replacement isn’t feasible, pipe insulation and a recirculation pump can provide substantial energy savings at a fraction of the cost.
Studies suggest that only 35 percent of the energy used in central domestic hot water systems at multifamily properties ends up as usable hot water at the tap. Much of the energy is lost in the distribution pipes and recirculation system.
Pipe insulation and demand controlled recirculation pumps are some of the most cost-effect ways to address an inefficient central domestic hot water system. Energy Trust currently offers incentives for both boiler and domestic hot water pipe insulation as well as recirculation pumps. See below for details.
| Measure | Incentive | Requirements |
|---|---|---|
| Boiler pipe insulation - low pressure steam (<15 psig) | $4 per linear foot | ≤ 1.5” pipe diameter, 1.5” min. insulation thickness > 1.5” pipe diameter, 2” min. insulation thickness |
| Domestic hot water pipe insulation | $4 per linear foot | Central gas-fired recirculation systems only ≤ 1.5” pipe diameter, 1.5” min. insulation thickness > 1.5” pipe diameter, 2” min. insulation thickness |
| Domestic hot water recirculation pump | $420 per system | Install controls to turn the pump off when return temperature reaches 105°F and on when the return temperature falls to 100°F. To qualify, a building must have three or more levels (excluding basement), one primary recirculation loop, no existing recirculation pump controls and gas-heated water. |
Use application Form 320P to apply for these incentives.
To learn more about incentives available for central domestic hot water systems at multifamily properties contact Nate Collins, trade ally coordinator, at 503.278.3075