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Gas Water Heating


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Insulation Contents:

CSI NUMBERS
DEFINITION
CONSIDERATIONS
COMMERCIAL STATUS
IMPLEMENTATION ISSUES
GUIDELINES

RESOURCES


CSI NUMBER

153 110 6000
155 600

DEFINITION:

Gas water heating for domestic hot water can be engineered to provide space heating as well as water heating. Known as a combination( or combo) system, a single appliance can perform two functions.


CONSIDERATIONS:

There are several positive features to a combination water heating/space heating (combo) system. Several high efficiency models are available that allow venting of the water heaters through a wall instead of a chimney. Electric heating is not involved permitting a reduced electric panel size. Less space is needed compared to two separate systems. The air handler can be located to minimize ductwork.

The combo system circulates hot water from the water heater through a heat exchanger in the air handler. A blower will move the heated air through a standard duct system. In the summer, an air conditioner is connected to the exchanger and the system functions similarly, with cool air being pushed through the ductwork.

The use of gas water heaters is generally considered a positive (although not perfect) environmentally-based choice. The pollutant levels created by natural gas combustion are less than other conventional water heating options except solar.

Commercial
Status
Implementation
Issues
technology suppliers cost financing public regulatory
Gas Water Heating
Gas Space/Water Heating

Legend
green Satisfactory
yellow Satisfactory in most conditions
red Satisfactory in Limited Conditions
black Unsatisfactory or Difficult

COMMERCIAL STATUS

TECHNOLOGY:

Well-developed.

SUPPLIERS:

Plentiful.

COST:

Competitive with other conventional options such as heat pumps and electric water heaters. Rebates are also available from the City of Austin for the installation of these systems.


IMPLEMENTATION ISSUES

FINANCING:

None.

PUBLIC ACCEPTANCE:

Generally accepted; low operating costs desirable; not well-known.

REGULATORY:

Must meet applicable codes.


GUIDELINES

  • 1.0 System Selection for Combination Systems