16
IM-BW4-5-02
[240013014 Rev. B [12/15/2020]
Boiler
Model
Burner
Input
Rate (gph)
Input
(MBH)
Tankless
Rating
(gpm)‡
BW5(B,R)AH-112
0.80
112
3.05
BW5(B,R)AH-140
1.00
140
3.25
BW5(B,R)AH-175
1.25
175
3.50
BW5(B,R)AH-217
1.55
217
3.80
‡ Gallons of water per minute heated from 40°F to 140°F with
200°F boiler water temperature, intermittent draw
SYSTEM PIPING
Boilers may be factory
packaged with tankless heater
coil
see figure below. Coil provides instantaneous heating
of water for domestic use if proper burner and water supply
line controls are used. Tankless coils are meant to provide
domestic hot water for intermittent draws, not continuous
flow.
NOTICE
Do not use tankless coil if your water is excessively
hard with lime or other deposits which will
accumulate inside the coil.
When using tankless coil, boiler is configured so Honeywell
L7248 operates with Honeywell L4006 low limit mounted on
well installed in tankless heater.
Tempering valve (mixing valve) is required as shown below.
Flow restrictor may be required on tankless coil inlet piping
so that flow rates are matched to boiler heat input (see
table).
Tankless Coil Piping Arrangement
Figure 11 -Tankless Coil Piping Arrangement
DANGER
Scald, Burn Hazard! Temperatures exceeding 120°F
will cause severe burns or death. Use of water
tempering device or mixing valve may be required
by the Authority having jurisdiction, follow all codes
as required before leaving installation.
!
