4
If you are using the AquaStar for combined space heating and potable water heating
(seeschematic diagram below), all piping and other components connected to the system must
be suitable for potable water, (b) toxic chemicals such as those commonly used for boiler
treatment to prevent corrosion and freezing must not be introduced into the system, and
(c) if the space heating requires water temperatures higher than those required for do-
mestic, potable water, a mixing valve or other similar device must be provided to reduce
scald hazard potential, (d) maximum system water temperature must not exceed 140°F
(60°C). DO NOT CONVERT AN EXISTING, CLOSED HOT WATER HEATING SYSTEM TO A
COMBINATION SPACE AND POTABLE WATER HEA TING SYSTEM USING THE AQUASTAR
OR ANY OTHER HEAT SOURCE.
GENERAL RULES TO FOLLOW
FOR SAFE OPERATION
1. You should follow these instructions when you install
your heater. In the United States: The installation must
conform with local codes or, in the absence of local codes,
the National Fuel Gas Code ANSI Z223.1/NFPA 54.
In Canada: The Installation should conform with CGA
B149.(1,2) INSTALLATION CODES and /or local
installation codes.
2. Carefully plan where you install the heater. Correct
combustion air supply and flue pipe installation are very
important. If not installed correctly, fatal accidents can be
caused by lack of air, carbon monoxide poisoning or fire.
3. The place where you install the heater must have
enough ventilation. The National Fire Codes do not allow
water heater installation in bathrooms, bedrooms or any
occupied rooms normally kept closed. See the section
below on locating the heater.
Open loop potable water and combination space heating system*
* To be used with a tank, check local codes. May not be permitted in some jurisdictions.
1. Maximum operating temperature of 125B: 140°F
2. Maximum heating capacity: 40°F rise 20°F rise
AquaStar 125B - 80,000 BTU/hr 40,000 BTU/hr
3. System shown is electric storage tank with recirculating supply drawn from the tapping for the lower heating element.
4. Schematic is for illustration and example only and must not be used for actual installation without appropriate
engineering and technical advice from a professional properly licensed in the locality where the installation is made.