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INSTALLATION
SFT 199 TANKLESS WATER HEATER
1.7.1 Domestic Hot Water System
The SFT series tankless water heaters have an independent piping circuit for
ef ciently generating Domestic Hot Water. When a faucet is opened to draw hot
water, water ow is detected with a ow sensor and the unit res up to begin
generating domestic hot water.
The heat exchanger has copper water passageways encased in the aluminum
heat transfer block. The aluminum heat exchanger acts as a heat buffer,
eliminating the “cold water sandwich effect” when turning on and off the water
repeatedly.
While the SFT series unit is less susceptible to lime scale build-up than other
units on the market, always consider water quality in the installation. We strongly
recommend treating hard water and adjusting the pH to 6.5 and 8.5. As a
reference Table 5 represents some of the drinking water guidelines published by
the US EPA. Consult a water treatment adviser in your area to assess your local
needs. Proper water treatment will aid in the longevity of the unit and ensure
maximum ef ciencies.
When installing and maintaining the water heater, you must consider water
quality. Water conditions outside of the levels speci ed below may damage the
water heater.
NOTE: The limited warranty provided with the water heater does not cover
defects, malfunctions or failures resulting from water conditions that are not in
accordance with the speci cations in the table below.
DESCRIPTION MAX MIN
Water Pressure 150 psi 40 psi
Programmable water temperature 149°F (65°C) 104°F (40°C)
Minimum Flow Rate to Activate DHW Sensor N/A 0.5 GPM
Acceptable pH range 8.5 pH 6.5 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 5: Recommended Water Quality Levels
WARNING
HOT WATER CAN SCALD!
Water Temperatures over 125°F
/ 52°C can cause severe burns
instantly or death from scalds.
Children, disabled, and elderly are
at highest risk of being scalded.
• Never leave them unattended
in or near the shower, bathtub
or sink.
• Never allow small children to
use a not water faucet or draw
their own bath.
TO AVOID INJURY:
• Feel and adjust water
temperature before bathing or
showering.
•
Water drained from the system
drain valve may be extremely
hot.
• Make sure all connections are
tight.
• Direct water fl ow away from
any person.
Figure 20: Overview of piping
connections
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