• Durable design with low maintenance and factory tested
• Unique 7 pass heat exchanger design maximizes heat transfer
• Insulated extended steel jacket
• Cast iron sections with built-in air separator
• Condensing stainless steel secondary heat exchanger with air separator
• Steel base, control module with indicator lights, blower assembly with observation port
• Gas/air manifold assembly, gas/air orifice plate for natural gas and separate plate furnished for conversion to propane
• Stainless steel burner cone and ring assembly, negative regulation gas valve, hot surface ignition system, air pressure switch
• Taco 007 system circulator
• Built-in bypass circulator system with sensor for temperature control, condensate drain trap, sidewall vent termination kit, 40 VA transformer, electrical junction box
• 30 psi ASME relief valve boiler sections and secondary heat exchanger tested for 50 psi working pressure
• Water temperature limit switch, section block temperature limit switch, combination pressure and temperature gauge, drain valve, flue thermal fuse
• 1/2" gas connection
• 3-section
• 1" minimum pipe size

weil-mclain gv90-4

weil-mclain gv90-4

• Designed to operate in low temperature condensing applications
• Outdoor reset and domestic hot water priority
• Modulates with 5:1 turn-down ratio
• High grade stainless steel burner features quiet operation
• U-Control gives the power for easy set-up and maintenance, multiple set-up and zone options, system sensing recognizes system and outdoor temperatures, temperature management for up to three different set-points, control multiple boilers from a single control panel, standard screen messages provide service alerts and maintenance reminders
• 30 psi ASME relief valve
• Drain valve
• Stainless steel burner (80, 105) with woven steel fiber mesh (155, 230, 299 and 399)
• Variable speed blower assembly, Venturi mixing system with air silencer, negative pressure regulated gas valve, 50 VA transformer
• Dual scale temperature and pressure gauge, outlet water temperature sensor, inlet water temperature sensor, flue gas temperature sensor, outdoor temperature sensor
• System water temperature sensors, fully removable jacket front, adjustable boiler legs, on/off power switch, condensate trap with drain tee assembly, propane conversion orifice (all except model 80), water treatment - inhibitor and test kit
• Control module - 3.5" LCD display, 3-boiler priorities with multiple preset system configurations, color-coded removable terminal blocks, multiple boiler functionality, alarm control functionality, ignition control, high limit and modulating temperature control, low water protection, outdoor reset, ability to control any combination of 3 circulators
• PVC/CPVC/PP vent material
• 1-1/2" minimum recommended pipe size
• 1-1/4 and 1-1/2" flanges (299) taco 0014 boiler circulators

weil-mclain ultra299s4

weil-mclain ultra299s4

• Designed to operate in low temperature condensing applications
• Outdoor reset and domestic hot water priority
• Modulates with 5:1 turn-down ratio
• High grade stainless steel burner features quiet operation
• U-Control gives the power for easy set-up and maintenance, multiple set-up and zone options, system sensing recognizes system and outdoor temperatures, temperature management for up to three different set-points, control multiple boilers from a single control panel, standard screen messages provide service alerts and maintenance reminders
• 30 psi ASME relief valve
• Drain valve
• Stainless steel burner (80, 105) with woven steel fiber mesh (155, 230, 299 and 399)
• Variable speed blower assembly, Venturi mixing system with air silencer, negative pressure regulated gas valve, 50 VA transformer
• Dual scale temperature and pressure gauge, outlet water temperature sensor, inlet water temperature sensor, flue gas temperature sensor, outdoor temperature sensor
• System water temperature sensors, fully removable jacket front, adjustable boiler legs, on/off power switch, condensate trap with drain tee assembly, propane conversion orifice (all except model 80), water treatment - inhibitor and test kit
• Control module - 3.5" LCD display, 3-boiler priorities with multiple preset system configurations, color-coded removable terminal blocks, multiple boiler functionality, alarm control functionality, ignition control, high limit and modulating temperature control, low water protection, outdoor reset, ability to control any combination of 3 circulators
• PVC/CPVC/PP vent material
• 1-1/4" minimum recommended pipe size
• 1 and 1-1/4" flanges (155 and 230) taco 0014 boiler circulators

weil-mclain ultra230s4

weil-mclain ultra230s4

• Designed to operate in low temperature condensing applications
• Outdoor reset and domestic hot water priority
• Modulates with 5:1 turn-down ratio
• High grade stainless steel burner features quiet operation
• U-Control gives the power for easy set-up and maintenance, multiple set-up and zone options, system sensing recognizes system and outdoor temperatures, temperature management for up to three different set-points, control multiple boilers from a single control panel, standard screen messages provide service alerts and maintenance reminders
• 30 psi ASME relief valve
• Drain valve
• Stainless steel burner (80, 105) with woven steel fiber mesh (155, 230, 299 and 399)
• Variable speed blower assembly, Venturi mixing system with air silencer, negative pressure regulated gas valve, 50 VA transformer
• Dual scale temperature and pressure gauge, outlet water temperature sensor, inlet water temperature sensor, flue gas temperature sensor, outdoor temperature sensor
• System water temperature sensors, fully removable jacket front, adjustable boiler legs, on/off power switch, condensate trap with drain tee assembly, propane conversion orifice (all except model 80), water treatment - inhibitor and test kit
• Control module - 3.5" LCD display, 3-boiler priorities with multiple preset system configurations, color-coded removable terminal blocks, multiple boiler functionality, alarm control functionality, ignition control, high limit and modulating temperature control, low water protection, outdoor reset, ability to control any combination of 3 circulators
• PVC/CPVC/PP vent material
• 1-1/4" minimum recommended pipe size
• 1 and 1-1/4" flanges (155 and 230) taco 0014 boiler circulators

weil-mclain ultra155s4

weil-mclain ultra155s4

Weil-Mclain WGO-6-S4

Weil-Mclain WGO-6-S4

Weil-Mclain WGO-5-S4

Weil-Mclain WGO-5-S4

• Dedicated water-only oil boiler with cast iron sections - no tankless heater or cover plate
• Quick open top and swing-away burner door with full chamber access increases visibility for inspection and servicing
• Two flue outlets- rear and top - for complete venting flexibility
• Recessed target wall design protects unit from flue brushes

weil-mclain wgo-4-s4

weil-mclain wgo-4-s4

• Dedicated water-only oil boiler with cast iron sections - no tankless heater or cover plate
• Quick open top and swing-away burner door with full chamber access increases visibility for inspection and servicing
• Two flue outlets- rear and top - for complete venting flexibility
• Recessed target wall design protects unit from flue brushes
• Includes factory-wired circulator, service switch and Weil-McLain exclusive captured elastomer seals for added reliability

weil-mclain wgo-3-s4

weil-mclain wgo-3-s4

• Dedicated water-only oil boiler with cast iron sections - no tankless heater or cover plate
• Quick open top and swing-away burner door with full chamber access increases visibility for inspection and servicing
• Two flue outlets- rear and top - for complete venting flexibility
• Recessed target wall design protects unit from flue brushes
• Includes factory-wired circulator, service switch and Weil-McLain exclusive captured elastomer seals for added reliability

weil-mclain wgo-2-s4

weil-mclain wgo-2-s4