305, 505, 705 Indoor Manual
35
Space
Heating
If the water heater is to be used for both water (potable) heating and space heating then the following apply.
•
The piping and components connected to the water heater shall be suitable for use with potable water.
•
Toxic chemicals, such as used for boiler treatment, shall not be introduced into the potable water.
•
The water heater shall not be connected to any heating system or components previously used with a
nonpotable water heating appliance.
•
When the system requires water for space heating at temperatures higher than required for other uses, a
means such as a mixing valve shall be installed to temper the water for other uses in order to reduce the
scald hazard potential.
Temperature Setting
When using this appliance to provide domestic hot water it is recommended that the domestic hot water
temperature be reduced to acceptable temperatures in accordance with local codes. In the absence of local
codes it is recommended that the domestic hot water temperature be set to 140º F (60º C) or lower in accordance
with UPC 501.6 by using mixing valves or the remote controller for the water heater.
Pumps
Only use pumps of brass or stainless steel construction. Do not use pumps of iron construction as they will
oxidize and clog the inlet filter on the appliance.
Pumps circulating water through the water heater must be sized to overcome the pressure loss through the water
heater, the heating system, and any additional plumbing pressure losses. The pressure drop curve based on the
water heater model is provided in this manual.
Replacement
When replacing an existing space heating application’s water heating source (boiler, tank water heater, tankless
water heater, etc.) with these water heaters, ensure that the water heaters are sized to adequately provide the
necessary BTU input for the desired space heating application. These water heaters are designed to maintain a
constant outlet temperature and will supply only the necessary amount of BTU’s to maintain that temperature.
Depending on the application the maximum BTU rating of the unit may not be achieved.
Iron Components
Do not use these water heaters directly for space heating applications involving iron radiators or applications with
any iron components. Iron components may oxidize creating rust that will clog the inlet filter of the water heater.
Glycol
If glycol is to be circulated through the water heater, only use propylene glycol in a 40/60 glycol/water mix ratio. It
is recommended that distilled water be used to prevent particulate from clogging the filter.
Glycol is toxic if consumed. Provisions must be made to the piping system to guarantee that glycol will never be
introduced into the potable water system.
The glycol solution must be compatible with the following items: copper, brass, bronze, rubber, a 283 micron filter,
and any other associated plumbing fixtures. Check with the glycol manufacturer to ensure that the solution will
pass through the 283 micron filter.
Space heating applications are considered commercial applications for warranty purposes.
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