Pre-Installation
3
Operating Restrictions
• Maximum boiler water temperature is
194ºF.
• Maximum working pressure for inner
(domestic water) tank is 125 psig.
• Maximum working pressure for outer
(boiler water) tank is 43.5 psig.
• Water quality limitations (based on E.P.A
National Secondary Drinking Water
Regulations):
- Chloride, less than 150 ppm or mg/l
- pH value min. 6, max. 8
- Total hardness 3 - 7 grains/gallon or 50-120
ppm or mg/l.
- Total Dissolved Solids (TDS), less than
120 ppm or mg/l.
- Iron less than 0.3 ppm or mg/l.
- Aluminum, less than 0.2 ppm or mg/l.
- Copper, less than 1 ppm or mg/l.
- Manganese, less than 0.05 ppm or mg/l.
- Zinc, less than 5 ppm or mg/l.
In hard water areas (more than 7 grains of
hardness) soften the cold domestic supply
water to the appliance to prevent scaling.
Any water conditioning system must be
installed and maintained in accordance with
manufacturer’s specifications.
Do not install the water heater on any appli-
cation if the boiler piping contains non-oxy-
gen barrier tubing or if the boiler piping is
considered an “open system”. Exposing the
outer tank of the water heater to oxygen
contamination will lead to premature tank
failure and denial of the warranty.
NOTICE
NOTICE
BEST PRACTICE
Comfort manual _Comfort 55 9/8/14 10:29 AM Page 5