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Part Number 550-110-732/0703
GWS
Gas-Fired Water Boilers –
Boiler Manual
15 Ratings
DOE
Install GWS boilers for residential radiant panel systems, converted gravity
heating systems or other low water temperature applications per instruc-
tions in this manual to avoid damage due to condensation.
GWS boilers are CSA design certified for installation on combustible floor-
ing.
GWS boilers are ASME rated for 50 psig working pressure.
1. Add “N-I” for natural gas boiler — “P-I” for propane gas boiler.
2. Based on standard test procedures prescribed by the United States Department
of Energy.
3. Net I=B=R ratings are based on net installed radiation of sufficient quantity for the
requirements of the building and nothing need be added for normal piping and
pickup. Ratings are based on a piping and pickup allowance of 1.15. An additional
allowance should be made for unusual piping and pickup loads.
4. GWS boilers require special venting, consistent with Category III or IV boiler. Use
only the vent materials and methods specified in GWS Vent Manual. GWS boilers
may be direct-vented (using 3" diameter air piping) as specified in the GWS Vent
Manual.
5. As an Energy Star Partner, W-T has determined that the GWS-063 meets the
Energy Star guidelines for energy efficiency.
6. The boiler must be equipped with specially-sized orifices for high altitude
applications. See page 8 for details.
