Connect Piping - Tankless Heater - Weil-McLain EG 5 Series Manual

EG PEG
&
SERIES
Connect piping – tankless heater (optional)
EG and EGH boilers for tankless heater applica-
tion are available only on special order as factory-
installed optional equipment. Standard boilers
cannot be adapted for heater use. Install a tankless
heater only in a steam boiler or forced hot water.
For correct operation, install as shown in Figure 24 (water boilers)
or Figure 25 (steam boilers).
1. Automatic mixing valve must be installed per mixing valve
manufacturer's instructions.
2. Flow regulating valve must be installed. Size according to
intermittent draw of heater as shown in following table.
3. Operating control with a small differential scale is recom-
mended. Install in temperature control tapping in heater
plate.
4. In hard water areas, it is advisable to soften cold domestic
supply water to the tankless heater to prevent lime buildup.
Tankless heater piping EG (water boiler)
Piping Connections not furnished. Use
brass plugs in tees and crosses to facilitate
cleaning in hard water areas.
Tankless heater piping EG/PEG/EGH (steam boiler)
Part Number 550-142-782/1112
5 EGH 5
SERIES
-
GAS FIRED BOILERS
Minimum recommended pipe sizes
Heating
Boiler Model Number
1RWH 
Water
EG-35 E-624
EG-40 E-624
EG-45 E-624
EG-50 E-626
EG-55 E-626
EG-65 E-632
EG-75 E-632
Steam
35-S-29
EG/PEG-35
35-S-29
EG/PEG-40
35-S-29
EG/PEG-45
35-S-29
EG/PEG-50
35-S-29
EG/PEG-55
35-S-29
EG/PEG-65
35-S-29
EG-75
35-S-29
EGH-85
35-S-29
EGH-95
35-S-29
EGH-105
35-S-29
EGH-115
35-S-29
EGH-125
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Standard Plumbing Code provided that:
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—
BOILER MANUAL
Continuous
Intermittent
Draw GPM
Draw GPM
100°F Av.
100°F Av.
Temp. Rise Temp. Rise
1RWH 
1RWH 
3.00 1.60
3.00 2.00
3.25 2.40
4.00 2.80
4.25 3.20
4.50 4.00
4.50 4.80
3.00 1.60
3.00 2.00
3.25 2.40
3.25 2.80
3.50 3.20
3.75 4.00
4.00
4.80
4.00 5.00
4.00 5.00
4.00 5.00
4.00 5.00
4.00 5.00
KDYLQJ D WR[LFLW\ UDQJH RU FODVV RI  DV OLVWHG LQ &OLQLFDO
7R[LFRORJ\ RI &RPPHUFLDO 3URGXFWV DQG
Inlet and Temp.
Outlet Control
Tappings Tapping
½" ¾"
½" ¾"
½" ¾"
½" ¾"
½" ¾"
½" ¾"
½" ¾"
¾" ¾"
¾" ¾"
¾" ¾"
¾" ¾"
¾" ¾"
¾" ¾"
¾" ¾"
¾" ¾"
¾" ¾"
¾" ¾"
¾" ¾"
¾" ¾"
21