The Central Boiler outdoor furnace is located outside, typically 30 to 200 feet (but as far as 500 feet) away from your home or building, and works with any existing heating system.
A water jacket surrounds the furnace firebox and heat exchanger, and heated water is circulated to your home or building through insulated underground pipes — an efficient way to move heat over distances.
The outdoor furnace is designed to work with any existing heating system. Water-to-air or water-to-water heat exchangers or direct circulation conveys the heat into the structure’s forced-air furnace, radiant baseboard, or radiant floor heating system. This allows you normal thermostatic temperature control.
The outdoor furnace can provide heat for all your domestic hot water by adding a water-to-water heat exchanger. You can turn off your hot water heater and save even more money!
The outdoor furnace has the ability to heat multiple buildings, such as a garage, workshop, shed, greenhouse, or barn — without using other heating sources. It can even be used to heat a swimming pool or hot tub.
Classic Cutaway View
Classic Side Access Panel
CL 5036 w/ Pump In Bldg.
CL 5036 with 1 Pump
CL 6048 with Pump Installed in Building
CL 6048 with 1 Pump Installed
CL 6048 with 3 Pumps Installed
CL 7260 Showing PEX Piping Options
Classic Dimensions – Furnace & Foundation
E-Classic 2400 Cutaway
E-Classic 1400 with 1 Pump Installed
E-Classic 1400 with 2 Pumps Installed
E-Classic 1450 with 1 Pump Installed
E-Classic 1450 with 2 Pumps Installed
E-Classic 2400 with 1 Pump Installed
E-Classic 2400 with 3 Pumps Installed
E-Classic 3200 with 1 Pump Installed
E-Classic 3200 with 2 Pumps Installed
E-Classic 1400, 2400, 3200 Furnace & Foundation
Classic Chimney Reinforcement Recommendations
E-Classic Chimney Reinforcement
ThermoPEX and Central Therm
ThermoPEX / Central Therm Install
Water-to-Water Heat Exchanger
Forced Air System
Wiring Diagram for Forced Air
Forced Air System – Down Draft Furnace
Wiring Diagram – Two Tmstat 588 & Zn Valve
Wiring Diagram – Tmstat 588, Zn Valve, Trans
Wiring Diagram – Tmstat 587 & No Zn Valve
Wiring Diagram – Tmstat 587 & Zn Valve
Wiring Diagram – 3 Stage System with Heat Pump
Dual System (Baseboard/Forced Air)
Dual System (In Floor Radiant/Forced Air)
Baseboard System Three Way Zn Valve
Existing Boiler (Direct Plumbed Depressurized)
Existing Boiler (w/ Wraparound)
Radiant Heat Single Zone
Radiant Heat w/ Flow Check Valve
Sample PEX Piping Layout
Wiring – Valve, stat, Trans, Pump
Multi Zone In-Floor
Radiant Floor Heat
Radiant Heat Multi Zone In-Floor
Large Manifold Assembly
Pool or Hot Tub Hook-up
Greenhouse Heating Options
Suspended Space Heaters
Heat for Multi-Buildings
Wiring – Aquastat/Heat Exchanger
Kickspace Heater
Panel Radiator Install
High Volume Water Heating
Fan Relay with Limit Switch
