Retrofit Integrated Space & Water Heating: Field Assessment: Minneapolis, Minnesota (Fact Sheet)

Technical Report · Thu May 01 04:00:00 EDT 2014

DOI:https://doi.org/10.2172/1132127· OSTI ID:1132127

This project analyzed combined condensing water heaters or boilers and hydronic air coils to provide high efficiency domestic hot water and forced air space heating. Called 'Combi' systems, they provided similar space and water heating performance less expensively than installing two condensing appliances. The system's installed costs were cheaper than installing a condensing furnace and either a condensing tankless or condensing storage water heater. However, combi costs must mature and be reduced before they are competitive with a condensing furnace and power vented water heater (EF of 0.60). Better insulation and tighter envelopes are reducing space heating loads for new and existing homes. For many homes, decreased space heating loads make it possible for both space and domestic water heating loads to be provided with a single heating plant. These systems can also eliminate safety issues associated with natural draft appliances through the use of one common sealed combustion vent.

• Research Organization: National Renewable Energy Laboratory (NREL), Golden, CO (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office
• DOE Contract Number: AC36-08GO28308
• OSTI ID: 1132127
• Report Number(s): DOE/GO--102014-4379; KNDJ-0-40338-00
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
Boiler Based Combi Systems
Building America
Combi Heating Systems
Combi System Summer Efficiency
DHW Performance
Direct Vent Burner
Dual Integrated Appliances
Forced Air Combi Systems
Hydronic Air Handlers
NorthernSTAR
Residential
Residential Buildings
Storage Water Heater Based Combi Systems
Tankless Water Heater Based Combi Systems