Weil-McLain EG manual Optional heaters, Tankless heater piping water boiler

4 EG, PEG, EGH GAS-FIRED BOILERS — SERIES 4 — BOILER MANUAL

Optional heaters

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.

Figure 20 Tankless heater piping (water boiler)

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)

Notes	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.

Part Number 550-110-639/0703 13