LP-436 Rev. 5.20.15
5
High heat sources (sources generating heat 100oF / 37oC or
greater, such as stove pipes, space heaters, etc.) may damage
plastic components of the water heater as well as plastic
vent pipe materials. Such damages ARE NOT covered by
warranty. It is recommended to keep a minimum clearance of
8” from high heat sources. Observe heat source manufacturer
instructions, as well as local, state, provincial, and national
codes, laws, regulations and ordinances when installing this
water heater and related components near high heat sources.
A. Improper Combustion
Do not obstruct the ow of combustion and ventilating air.
Adequate air is necessary for safe operation. Obstructing the
ow of combustion or ventilating air could result in property
damage, serious personal injury, or death.
B. Gas
Should overheating or gas supply fail to shut o, turn o the
manual gas control valve to the water heater.
C. When Servicing the Water Heating System
To avoid electric shock, disconnect electrical supply before
performing maintenance.
NOTE: When inquiring about service or troubleshooting,
reference the model and serial numbers from the water
heater rating label.
To avoid severe burns, allow water heater and associated
equipment to cool before servicing.
D. Heater Water
Do not use petroleum-based cleaning or sealing compounds
in a water heating system. Gaskets and seals in the system
may be damaged. This can result in substantial property
damage.
Do not use “homemade cures” or “patent medicines”.
Damage to the water heater, substantial property damage,
and/or serious personal injury may result.
E. Freeze Protection
NOTE: Consider piping and installation when determining
heater location.
Failure of the water heater due to freeze related damage IS
NOT covered by product warranty.
Be sure to disconnect electrical power before performing
service. Failure to do so could result in electrical shock,
property damage, serious personal injury, or death.
NEVER use any toxic chemical, including automotive, standard
glycol antifreeze, or ethylene glycol made for hydronic (non-
potable) systems. These chemicals can attack gaskets and
seals in water systems, are poisonous if consumed, and can
cause personal injury or death.
Households with small children, disabled, or elderly persons
may require a 120oF or lower temperature setting to prevent
severe personal injury or death due to scalding.
F. Water Temperature Adjustment
If the water heater is going to have a set temperature above
120oF, you must use an ASSE 1017 rated mixing valve to avoid
severe burns or death from scalding temperatures.
Approximate Time / Temperature Relationships in Scalds
120oF More than 5 minutes
125oF 1 1/2 to 2 minutes
130oF About 30 seconds
135oF About 10 seconds
140oF Less than 5 seconds
145oF Less than 3 seconds
150oF About 1 1/2 seconds
155oF About 1 second
Table 1 - Approximate Time / Temperature Relationships in Scalds
Outlined below are water quality parameters that need to be
met in order for the system to operate eciently for many years.
Water Hardness
Water hardness is mainly due to the presence of calcium and
magnesium salts dissolved in water. The concentration of these
salts is expressed in mg/L, ppm, or grains per gallon as a measure
of relative water hardness. Grains per gallon is the common
reference used in the US water heater industry. Hardness
expressed as mg/L or ppm may be divided by 17.1 to convert to
grains per gallon. Water may be classied as very soft, slightly
hard, moderately hard, or hard based on its hardness number.
The minerals in the water precipitate out as the water is heated
and cause accelerated lime scale accumulation on a heat transfer
surface. This lime scale build-up may result in premature failure
of the water heater. Operating temperatures above 135oF will
further accelerate the build-up of lime scale and may shorten
the service life of the water heater.
Water that is classied as hard and very hard must be softened
to avoid water heater failure.
G. Water Chemistry Requirements
Chemical imbalance of the water supply may aect eciency
and cause severe damage to the water heater and associated
equipment. HTP recommends having water quality
professionally analyzed to determine whether it is necessary to
install a water softener. It is important that the water chemistry
on both the domestic hot water and central heating sides are
checked before installing the water heater, as water quality
will aect the reliability of the system. In addition, operating
temperatures above 135oF will further accelerate the build-up of
lime scale and may shorten the service life of the water heater.
Failure of a water heater due to lime scale build-up, low pH, or
other chemical imbalance IS NOT covered by the warranty.
