Notes
Part Number 550-110-639/0512
21
EG
•
PEG
•
EGH Gas-firEd boilErs — sEriEs 4 — boilEr manual
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.
Figure 24 Tankless heater piping (water boiler)
Connect piping – tankless heater (optional)
Table 10 Minimum recommended pipe sizes
Boiler Model
Heating
Number
(Note 3)
Intermittent
Draw GPM
100°F Av.
Temp. Rise
(Note 1)
Continuous
Draw GPM
100°F Av.
Temp. Rise
(Note 2)
Inlet and
Outlet
Tappings
Temp.
Control
Tapping
Water
EG-35 E-624 3.00 1.60 ¹⁄₂” ³⁄₄”
EG-40 E-624 3.00 2.00 ¹⁄₂” ³⁄₄”
EG-45 E-624 3.25 2.40 ¹⁄₂” ³⁄₄”
EG-50 E-626 4.00 2.80 ¹⁄₂” ³⁄₄”
EG-55 E-626 4.25 3.20 ¹⁄₂” ³⁄₄”
EG-65 E-632 4.50 4.00 ¹⁄₂” ³⁄₄”
EG-75 (Note 5) E-632 4.50 4.80 ¹⁄₂” ³⁄₄”
EGH-85
(Notes 4 & 6)
E-632 5.50 5.60 ¹⁄₂” ³⁄₄”
EGH-95 (Note 4) E-632 5.50 5.55 ¹⁄₂” ³⁄₄”
EGH-105 E-632 5.75 5.75 ¹⁄₂” ³⁄₄”
EGH-115 E-632 6.00 6.00 ¹⁄₂” ³⁄₄”
EGH-125 E-632 6.00 6.00 ¹⁄₂” ³⁄₄”
Steam
EG/PEG-35 35-S-29 3.00 1.60 ³⁄₄” ³⁄₄”
EG/PEG-40 35-S-29 3.00 2.00 ³⁄₄” ³⁄₄”
EG/PEG-45 35-S-29 3.25 2.40 ³⁄₄” ³⁄₄”
EG/PEG-50 35-S-29 3.25 2.80 ³⁄₄” ³⁄₄”
EG/PEG-55 35-S-29 3.50 3.20 ³⁄₄” ³⁄₄”
EG/PEG-65 35-S-29 3.75 4.00 ³⁄₄” ³⁄₄”
EG-75 35-S-29 4.00 4.80 ³⁄₄” ³⁄₄”
EGH-85 35-S-29 4.00 5.00 ³⁄₄” ³⁄₄”
EGH-95 35-S-29 4.00 5.00 ³⁄₄” ³⁄₄”
EGH-105 35-S-29 4.00 5.00 ³⁄₄” ³⁄₄”
EGH-115 35-S-29 4.00 5.00 ³⁄₄” ³⁄₄”
EGH-125 35-S-29 4.00 5.00 ³⁄₄” ³⁄₄”
NOTES
Weil-McLain ratings based on 60 PSIG domestic water pres-
sure at heater.
1. Gallons of water per minute heated from 40°F to 140°F with
200°F boiler water temperature.
2. Continuous draw – no recovery period.
3. These single wall heat exchangers comply with National
Standard Plumbing Code provided that:
• boiler water (including additives is practically non toxic,
having a toxicity range or class of 1, as listed in Clinical
Toxicology of Commercial Products, and
• boiler water pressure is limited to max. 30 psig by
approved water or steam relief valve.
4. EGH-85 & 95 Standing pilot systems - no tankless option
5. EG-75 Standing pilot systems - no tankless option
6. EGH-85 Water - use one heater only.
Piping Connections not furnished. Use
brass plugs in tees and crosses to facilitate
cleaning in hard water areas.
Figure 25 Tankless heater piping (steam boiler)
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