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Connect tankless heater piping
Part number 550-142-330/0421
24
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 4 — Boiler Manual
SERVICETECHNICIANONLY—readandfollowcompletely.
Table 7 Tankless heater ratings
Boiler
model
number
Heater
number
Intermittent
draw
ratings
(gpm)*
Inlet and Outlet
tapping sizes
SGO-3 35-S-29 3.25 ¾"
SGO-4 35-S-29 3.50 ¾"
SGO-5 35-S-29 3.75 ¾"
SGO-6 35-S-29 4.00 ¾"
SGO-7 35-S-29 4.00 ¾"
SGO-8 35-S-29 4.00 ¾"
SGO-9 35-S-29 4.00 ¾"
NOTES:
1. To avoid supplying steam to system during summer tankless operation, raise water level to one inch
above normal water line.
2. Gallons of water per minute heated from 40°F to 140°F with 200°F boiler water temperature. Tested in
accordance with AHRI testing and rating standard for indirect tankless water heaters tested with boilers.
Hot Water Can Scald!
•Consumer Product Safety Commission and
some states recommend domestic hot water
temperature of 130°F or less.
•When installing an automatic mixing valve,
selection and installation must comply with
valve manufacturer’s recommendations and
instructions.
•Water heated to a temperature suitable for
clothes washing, dish washing and other sanitiz-
ing needs will scald and cause injury.
•Children, elderly, infirm or physically handi-
capped persons are more likely to be injured
by hot water. Never leave them unattended in
or near a bathtub, shower or sink. Never allow
small children to use a hot water faucet or draw
their own bath. If anyone using hot water in the
building fits this description, or if state laws or
local codes require certain water temperatures
at hot water faucets, take special precautions:
•Install automatic mixing valve set according
to those standards.
•Use lowest practical temperature setting.
•Check water temperature immediately after
first heating cycle and after any adjustment.
To pipe tankless heater
1. Size piping no smaller than tankless heater inlet and
outlet.
2. Following controls (furnished by others) must be in-
stalled:
a. Automatic mixing valve. See Figure 17.
(Read
at left.)
b. Flow regulating valve. Size according to intermittent
draw of tankless heater. See Table 7 below. Follow
valve manufacturer’s instructions to install.
3. Additional anti-scald devices may be installed at each
hot water faucet, bath and shower outlet.
4. In hard water areas, soften cold domestic supply water
to heaters to prevent lime build-up.
Studies have indicated that dangerous
bacteria can form in potable water distri-
bution systems if certain minimum water
temperatures are not maintained. Contact
local health department for more informa-
tion.
Tankless water heaters for SGO boilers
have been tested and certied by
CSA Group (certicate # 2552127).
NSF/ANSI372
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