Brochure

NON-
CONDENSING
BOILER
NON-
CONDENSING
BOILER
We reserve the right to change our products and their relevant technical data, contained in this publication, at any time and without prior notice.
Caleffi North America, Inc. · 3883 W. Milwaukee Road · Milwaukee, WI 53208 · Tel: [phone] · Fax: [phone]
www.caleffi.us / sales@caleffi.com
© Copyright 2012 Caleffi North America, Inc.
ThermoBloc
™
series 281
Boiler protection recirculation and distribution unit. Connections 1" and 1-1/4" NPT male and sweat with unions. Brass body. Brass shutter locking nut.
Polysulfone shutter. Stainless steel spring. Polyphenylene Sulfide (PPS) flapper check valve. EPDM seal elements. Medium water and glycol solutions.
Maximum percentage of glycol 50%. Maximum working pressure 150 psi (10 bar). Working temperature range 40–210°F (5 –100°C). Temperature gauge
scale 30–250°F (0–120°C). Built-in wax thermostatic sensor: setting temperature 140°F (60°C) standard; 115°F (45°C), 130°F (55°C) and 160°F (70°C)
optional. Sensor cartridge accuracy 3.6°F (±2°C). Hot inlet from boiler complete closing temperature Tset +18°F (10°C). Three-speed pump model Wilo Star
S-16U15; electric supply 115 V – 60Hz. Complete with insulation.
SPECIFICATION SUMMARIES
Use safety devices according to
local regulations
Use safety devices according to
local regulations
Non-condensing boiler, direct supply to the system.
Non-condensing boiler, direct connection to buffer tank.