7
and possibly scalding hot water at the fixtures. In
addition, savings of hot water will be achieved since
the user will not waste as much hot water while
seeking water temperature to his liking. Higher
temperature hot water required by dishwashers and
automatic washers is possible by piping the hot
water from the heater prior to entering the mixing
valve. The mixing valve should be “trapped” by
installing it below the cold water inlet to heater to
prevent lime formation in the valve.
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3. FLUSHING OF HEATER — All water contains
some sediment which settles on the inside of the
coil. Consequently, the heater should be periodically
backwashed. This is accomplished by installing
hose bibs as illustrated and allowing water at city
pressure to run into hose bib A, through the heater,
and out hose bib B until the discharge is clear. The
tees in which the hose bibs are located should be
the same size as heater connections to minimize
pressure drop.
4. HARD WATER — A water analysis is necessary to
determine the hardness of your potable water. This
is applicable to some city water and particularly to
well water. An appropriate water softener should
be installed based on the analysis and dealer’s
recommendation. This is not only beneficial to the
tankless heater but to piping and fixtures plus the
many other benefits derived from soft water.
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TABLE 2: V1-2 TANKLESS HEATER DATA G. INSTALL SMOKEPIPE — The CLS should be vented
into a fireclay tile-lined masonry chimney or chimney
constructed from type L vent or a factory built chimney
that complies with the type HT requirements of UL103.
The chimney and vent pipe shall have a sufficient draft
at all times, to assure safe proper operation of the boiler.
See Figure 5 for recommended installation.
Figure 5: Recommended Smokepipe Arrangement
and Chimney Requirements
1. Install a draft regulator (supplied with boiler)
following the instructions furnished with the
regulator. See Figure 6 for alternate draft regulator
locations.
2. Consider the chimney overall. Chimneys that have
a high heat loss may become less suitable as the
heat loss of the home goes down and the efficiency
of the boiler installed goes up. Most homes have
a chimney appropriate for the fuel and the era in
which the home was built. That may have been a
coal fired or an inefficient oil fired boiler built into
a home without insulation or storm windows. With
increasing fuel prices that home probably has been
insulated and fitted with storm windows so that
the heat loss of the home has been reduced. This
requires less fuel to be burned and sends less heat up
the chimney.
A new boiler probably has a higher efficiency than
the boiler being replaced. That probably means that
the stack temperature from the new boiler will be
lower than that from the old boiler and with less
room air being drawn up the chimney to dilute the
stack gases. The combination of a large uninsulated
chimney, reduced firing rate, reduced firing time,
lower stack temperature and less dilution air can,
in some cases, contribute to the condensing of
small amounts of water vapor in the chimney. Such
condensation, when it occurs, can cause chimney
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