Description Min Max
Water pressure 40 psi 150 psi
Minimum flow rate to activate DHW sensor 0.5 GPM N/A
Acceptable pH range 6.5 pH 8.5 pH
Total dissolved solids 500 mg/L
Total hardness 200 mg/L 11.68 gr/gal
Aluminum 0.05 to 0.2 mg/L
Chlorides 250 mg/L
Copper 1.0 mg/L
Iron 0.3 mg/L
Manganese 0.05 mg/L
Zinc 5 mg/L
Table 6 Domestic water quality guidelines
Warning
Bacteria growth can develop in domestic hot water tanks and indirect water
heaters if the minimum water temperature is not set high enough to prevent its
growth.
A potentially hazardous situation, which can cause serious injury or death, can
exist if the unused domestic water connections are capped off. The unused
domestic water connections are meant to be left open if not used to allow for
the air in the coil to expand and contract as the appliance is in operation.
3.12.2 Domestic hot water piping
The domestic water piping connections are located at the bottom of the appliance. The
connections are ¾" male NPT threads. The cold water inlet is on the right side and the hot water
outlet is on the left side.
A pressure relief valve must be installed:
With a maximum pressure setting of 150 PSI and rated for a minimum capacity of not less
than the rated input of the appliance (NOT supplied with the appliance) on the domestic
hot water outlet piping within 6" of the appliance.
Between the appliance’s outlet and any isolation valve to ensure the pressure relief valve
cannot be isolated by closing a valve. We recommend a valve kit designed for this
purpose to reduce installation time and to reduce the space required.
3.12.2 Domestic hot water piping
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