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7. Boilers may be factory packaged with a tanMess heater coil see figure below. This 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, no_J continuous flow.
IMPORTANT
Do not use a tankless coil if your water is excessively hard with
lime or other deposits which will accumulate inside the coil.
When using a tankless coil, the boiler has been configured so the Honeywell L8124C Combination
Hi/Low Limit Aquastat Relay mounts on a thermowell (provided) which needs to be installed in the 3/4"
tapping on the tankless coil. By mounting the aquastat on the coil, the tankless coil performance is
maximized by making the burner respond more quickly to a call for domestic hot water. A tempering
valve (mixing valve) is also recommended as shown in figure below. A flow restrictor may be required
on the tankless coil inlet piping so that flow rates are matched to boiler heat input (see table below).
Boiler
Model
3EW.65T
3EW.75T
3EWI.00T
4EW.90T
4EW1.25T
4EW1.50T
5EW1.20T
5EW1.75T
5EW2.00T
Burner Firing
Rate (gph)
0.65
0.75
1.00
0.90
1.25
1.50
1.20
1.75
2.00
Input
(MBH)
91
105
140
126
175
210
168
245
28O
Tankless
Rating (gpm):_
2.90
3.00
3.25
3.15
3.50
3.75
3.45
4.00
4.25
:_ Gallons of water per minute heated from 40°F to 140°F with
200°F boiler water temperature, intermittent draw
UNTEM,_I[R[O HOT WAT[R
TANKLESS COIL
OUT
CENTER LINE t
OF COLO TAp
-
L__-
_'Np
12