Connection to the space heating circuit through a drinkable water system as shown may be
prohibited by local code.
Non-ferrous pump (sized for combined head loss of boiler/water heater, air handler -
interconnecting piping)
Check valve (may be built into pump)
Potable water expansion tank
Filter required where contaminants are present in the supply water
Figure 31 Basic installation with tankless water heater
Note
The SFT 199 maximum water temperature is 149°F (65°C ). Ensure that this is hot
enough to meet the heating requirements of the space being heated.
If piped correctly, DHW takes priority over space heating. When the appliance detects reduced
water temperature (that is, a call for DHW), the system will reduce the fan speed.
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