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Part number 550-101-233/0903
GAS-FIRED WATER BOILER — Boiler Manual
44
Ratings
DOE
1. As an Energy Star Partner, Weil-McLain has determined
that Ultra boilers meet the Energy Star guidelines for energy
efficiency.
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. Ultra boilers require special venting, consistent with
Category IV boiler. Use only the vent materials and
methods specified in Ultra vent supplements. Ultra boilers
must be direct-vented. Ultra-230 can be vented with either
3" or 4" vent pipe. Vent length limits for 3" vent are not as
long as for 4" vent.
Notes
Notes
5. Weil-McLain Low temperature seasonal efficiency is based
on ASHRAE 103 test method, using boiler return water
temperature of 90°F, with boiler outlet water temperature
of 110°F.
6. Combustion efficiency is based on I=B=R testing procedure
BTS-2000, and equal to 100% minus flue loss.
7. Thermal efficiency is based on I=B=R testing procedure
BTS-2000.
8. Weil-McLain Low temperature efficiency is based on the
I=B=R testing procedures, using boiler return water
temperature of 90°F and boiler outlet water temperature
of 110°F.
9. Ratings shown are for sea level applications only. For
altitudes from sea level to 5,500 feet above sea level, the
Ultra boiler requires no modifications and automatically
derates itself by approximately 4% per 1000 feet above sea
level. For elevations above 5,500 feet, contact your local
Weil-McLain sales office for details.
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