Demand Control Systems Deliver Efficiency in Commercial Hot Water Use
Technical overview of the effectiveness of new demand control systems to reduce heating and pumping costs from hot water circulation in hospitality and commercial venues.
Simple Retrofit High-Efficiency Natural Gas Water Heater Field Test
Four high-efficiency natural gas water heaters were installed in homes to characterize their savings potential, installed efficiencies, and abilities to meet household demands.
Data & Reference
Utility Heat Pump Water Heater Calculator
Using several simple inputs, this application will determine the estimated savings and payback period for installing a heat pump water heater as a replacement for standard electric resistance water heating.
Combi Systems: Lessons Learned from the Field
Introduction to the technology and a discussion of lessons learned from a 200 system install project. Presented at the Presented at the ACEEE 2015 Hot Water Forum.
Tankless Water Heaters Update
Updates on water quality and installation issues, efficiency and savings, occupant satisfaction, and impact on gas distribution presented at the MN Blue Flame Gas Association Expo.
Tankless Water Heaters: Do They Really Save Energy?
The in situ efficiency of the storage water heaters was nearly 20% lower than rated, while that of the tankless water heaters was only 10% lower. This paper will discuss the causes, consequences, and possible ramifications of this reduced efficiency.
Measured Residential Hot Water End Use
High-resolution data on draw volume, length, flow rate, and spacing both overall and by hot water end use; based on data collected in ten homes in the Minneapolis/St. Paul metro area.
Application of a Linear Input/Output Model to Tankless Water Heaters
This study evaluates the applicability of a linear input/output model to gas-fired, tankless water heaters. The model can be used to reproduce performance metrics, such as the energy factor, and can be used to evaluate the impacts of alternative draw patterns and conditions.