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Part Number 550-110-639/0703
13
EG, PEG, EGH GAS-FIRED BOILERS — SERIES 4 — BOILER MANUAL
EG and EGH boilers for tankless heater application
are available only on special order as factory-installed
optional equipment. Standard boilers cannot be
adapted for heater use.
Tankless heater hook-up (forced hot water or steam boilers)
For correct operation, install as shown in Figure 20 (water boilers) or
Figure 21 (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 recommended.
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.
Optional heaters
4
Weil-McLain ratings based on 60 PSIG domestic
water pressure 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 pratically 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.
Notes
NOTE: Piping Connections not furnished. Use brass
plugs in tees and crosses to facilitate cleaning in
hard water areas.
Figure 21 Tankless heater piping (steam boiler)
Figure 20 Tankless heater piping (water boiler)