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8) Multiple Tankless Heaters - If two tankless heaters are installed in the boiler, it is recommended that each heater be
installed in parallel with its own mixing valve, relief valve, flow restrictor, etc.. This will permit either heater to be
removed from service for maintenance while still providing some domestic water to the building.
Tankless Heater
Model Number
For Use In
Boile rs
Continuous Draw
Heater Ratings
40° - 140° Rise
with 200°F Boiler
Temperature
Pressure Drop
Through Heater
(psi)
Minimum
Num ber of
Sections
Required Per
He ater
Clearance
Requirement
For Heater
Re moval
T-1
All Sizes 4.5 GPM 8.8 5 27"
T-2
All Sizes 5.0 GPM 18.0 6 32"
T-3
32-665 & Larger 6.0 GPM 1.2 8 42"
All Series 32 boilers are furnished with left and right heater end sections. It is possible to install a heater in both ends
provided the number of sections in the boiler in not less than the sum of the number of sections required for each
heater as indicated in the table. Example: T2 + T3 = 6 + 8 = 14 section or larger boiler.
Table 9: Tankless Heater Specifications
Figure 32: Tankless Heater Piping