39
Part Number 550-110-737/1108
GWS-090E
Gas-Fired Water Boiler –
Boiler Manual
15 Ratings
DOE
Install GWS-090E boilers for residential radiant panel systems, converted
gravity heating systems or other low water temperature applications per
instructions in this manual to avoid damage due to condensation.
GWS-090E boilers are CSA design certified for installation on combustible
flooring.
GWS-090E 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. The GWS-090E boiler requires special venting, consistent with Category III or IV
boiler. Use only the vent materials and methods specified in GWS Vent Manual.
The GWS-090E boiler 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-090E meets the
Energy Star guidelines for energy efficiency.
6. The boiler must be equipped with specially-sized orifices for high altitude ap-
plications. See page 8 for details.
Boiler
model
number
0–2,000 feet altitude
2,000–4,500 feet altitude
(Canada)
Net
I=B=R
ratings
(Btuh)
Boiler
water
content
(gallons)
DOE
seasonal
efficiency
(% A.F.U.E)
Vent
size
Input
(Btuh)
DOE Heating Capacity
(Output)
(Btuh)
Input
(Btuh)
Output
(Btuh)
(Note 1)
(Note 2)
(Note 6)
(Note 3)
(Note 5)
(Note 4)
GWS-090E
(Note 5)
90,000
77,000
81,000
69,300
67,000
2.1
85.0
3”
