Fulton Pulse DWH (PDWH) Domestic Water Heater - Manual (Page 25)

Installation
Guidelines
Pipe Material: Fulton recommends stainless
steel (300 or 400 series), galvanized steel,
or copper piping for potable water systems
incorporating a PDWH. Local code
requirements may also dictate feasible
materials.
Water Quality: Failure to maintain
appropriate water chemistry and quality will
void the factory warranty on the heater.
Water must be treated if it is not in
compliance with the guidelines below.
Hardness: 5-25 grains per gallon
Total Dissolved Solids: < 350ppm
PH: Shall not be aggressive and corrosive
Chlorides: <250 ppm
Installation
23-PDWH
System Requirements: Each PDWH-
1000 must be configured so the
temperature differential across the unit
should be no greater than 100 degrees
F. We recommend to those personnel
designing systems with a PDWH
incorporate a factor of safety to ensure
that the temperature differential will not
be greater than 100 degrees F at any
operating condition. Failure to remain
within this 100 degree temperature
differential will void the factory warranty
on the water heater.
Example Piping Systems: Typical
layout: Single heater piped with storage
tank. This is recommended for
installations where the user capacity is
greater than the output of the heater, or
where incoming water from the city or
where the difference between inlet and
outlet temperature is above 100
degrees F.
If excessive cycling is expected to occur
(greater than 1,000 cycles per month), a
storage tank system or other custom
engineered solution is required. Fulton is
not responsible for system designs that
cause the unit to excessively cycle or
have any parameters that are outside
the warranty.