Instructions / Assembly

9
 Do not use “homemade cures” or “boiler patent medicines”. Substantial property damage, damage to boiler, and/or serious
personal injury may result.
 Continual fresh make-up water will reduce boiler life. Mineral buildup in the heat exchanger reduces heat transfer, overheats
the stainless steel heat exchanger, and causes failure. Addition of oxygen from make-up water can cause internal corrosion in
system components. Leaks in the boiler or piping must be repaired at once.
F. BOILER WATER CHEMISTRY
 Sodium less than 20mGL.
 Water pH between 6 and 8
o Maintain water pH between 6 and 8. Check with litmus paper or have it chemically analyzed by water treatment
company.
o If the pH differs from above, consult local water treatment company for treatment needed.
 Hardness less than 7 grains
o Consult local water treatment companies for unusually hard water areas (above 7 grains hardness).
 Chlorine concentration less than 100 ppm
o Using chlorinated fresh water should be acceptable as levels are typically less than 5 ppm.
o Do not connect the boiler to directly heat swimming pool or spa water.
o Do not fill boiler or operate with water containing chlorine in excess of 100 ppm.
NOTE: It is recommended to clean heat exchanger at least once a year to prevent lime scale buildup. To clean the heat exchanger,
follow the maintenance procedure in Part 13, Section B of this manual.
ACIDITY
6 to 8 pH
CONDUCTIVITY
Less than 400 uS/cm at 25
o
C
CHLORIDE
Less than 100 ppm
IRON
Less than 0.5 mg/L
COPPER
Less than 0.1 mg/L
SODIUM
Less than 20 mg/L
HARDNESS
Less than 7 Grains
Table 1 – Water Quality Requirements
G. FREEZE PROTECTION FLUIDS
NEVER use automotive or standard glycol antifreeze, or ethylene glycol made for hydronic systems, with this boiler. Use only inhibited
propylene glycol solutions, which are specifically formulated for hydronic systems. Ethylene glycol is toxic and can attack gaskets and
seals used in hydronic systems.
Consider boiler piping and installation when determining boiler location.
NOTE: Damages resulting from incorrect installation or from use of products not approved by HTP, Inc. ARE NOT covered by warranty.