Dunkirk EMPIRE 3EWC0.80 Installation, Operation & Maintenance Manual page 15

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.
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, the Hydrolevel control is mounted
on control well in tankless heater.
Tempering valve (mixing valve) is recommended 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).
Figure 11 -Tankless Coil Piping Arrangement
SYSTEM PIPING
Boiler
Model
3EWC0.80T
4EWC1.00T
4EWC1.25T
5EWC1.55T
‡ Gallons of water per minute heated from 40°F to 140°F with
200°F boiler water temperature, intermittent draw
15
Burner
Input
Input
(MBH)
Rate (gph)
0.80 112
1.00 140
1.25 175
1.55 217
PN 240013012, Rev. B [12/15/2020]
Tankless
Rating
(gpm)‡
3.05
3.25
3.50
3.80