Boiler Controls

120175 McDonnell & Miller FS7-4SE - 1-1/4" Flow Switch With Stainless Steel Body And NEMA 7 & 9 Enclosure. Mcdonnell & Miller 120175 Instruction Manual Features: For hazardous environment applications requiring a NEMA 7 (Class I,...

119900 McDonnell & Miller FS7-4L - 1-1/4" Flow Switch With Extended Paddle & Paddle Arm 119900. Information: McDonnell & Miller FS7 Overview McDonnell & Miller FS7 Instruction Manual Features: Universal design serves the widest...

114795 McDonnell & Miller FS5-S-1 - 1" Flow Switch With Stainless Steel Body 114795. McDonnell & Miller FS5 Instruction Manual Features: In-line configuration eliminates need for a pipe tee Sizes available: 3/4" NPT, 1" NPT Materials...

115200 McDonnell & Miller FS4-3T2-1 - 1" Flow Switch With NPT Body Medium Flow Rate 115200. McDonnell & Miller FS4 Instruction Manual Features: For starting or stopping electrically operated equipment such as signal lights, alarms,...

114642 McDonnell & Miller FS4-3DS 1" Flow Switch With Stainless Steel Body & 2 SPDT switches 114642. McDonnell & Miller FS4 Brochure McDonnell & Miller FS4 Instruction Manual Universal design serves the widest variety of...

22-AV Armstrong SS Air Vent 3/4" NPT 600 psi. The Armstrong all-stainless steel guided lever air vents have been developed to provide positive venting of air/gases under pressure. For pressures to 600 psig (41 bar) or specific gravity down to 0...

13-AV Armstrong SS Air Vent 1" NPT 45 psi. The Armstrong all-stainless steel guided lever air vents have been developed to provide positive venting of air/gases under pressure. For pressures to 600 psig (41 bar) or specific gravity down to 0.50...

975003-701 Armstrong AAE-750 Air Vent. This Item Usually Ships Same Day!

113041 Bell & Gossett DT-2 Drain-O Tank Air Charger. DT-2 DRAIN-O-TANK® AIR CHARGER - The Drain-O-Tank Air Charger offers a sure, quick way to recharge a water-logged compression tank.  This Item Usually Ships The Same Day!

172815 McDonnell & Miller LWCO 157S-RLM. Please Contact Us For Lead Time.

173603 McDonnell & Miller 157S-MD Hi Pressure Level Control. McDonnell & Miller 150S/157S Instruction Manual Specifications For boilers of any steaming capacity Model 173603 - 157S-MD Monel bellows provides corrosion resistance Snap...

175402 McDonnell & Miller 157S-M Hi Pressure Level Control. *Please note this item is discontinued and replaced by the 172812 McDonnell & Miller 157S-M Hi Pressure Level Control. Information: McDonnell & Miller 150S/157S Instruction...

 **Discontinued 149700 McDonnell & Miller Mechanical Low Water Cut Off 67-M. Float Type Low Water Cut Off For Millivolt Service. P/N's 149400 and 354001 are the equivalent to P/N 149700. Information: McDonnell & Miller LWCO...

135600 McDonnell & Miller Mechanical Water Feeder 51-S. Mcdonnell & Miller 135600 Instruction Manual Features: For high capacity [up to 35,000 sq. ft. (3250m2)] low pressure steam and hot water boilers with cold water feed Optional...

134700 McDonnell & Miller Mechanical Water Feeder 51. For low pressure steam and hot water boilers larger than 5,000 sq. ft. (465m2) capacity with cold water feed Quick-change replaceable cartridge valve and strainer Optional...

The Series 153827-LWCO McDonnell & Miller PSE-801-120 Probe Control type LWCO uses patented technology to monitor changes in water conductivity. When defined parameters are exceeded the new PSE-800 makes a decision to shut the burner off based...

The Series 153876 - McDonnell & Miller PS-801-U-120 Probe Control type LWCO uses patented technology to monitor changes in water conductivity. When defined parameters are exceeded the new PSE-800 makes a decision to shut the burner off based on...

Hoffman Float Switch With Float Rod DA0391. *Please note image is generic. This Item Usually Ships The Same Day!

135100 McDonnell & Miller 51-2-HD Head Mechanism for Mechanical Water Feeder. This Item Usually Ships The Same Day!

115100 McDonnell & Miller FS4-3T1-1 - 1" Flow Switch With NPT Body High Flow Switch. McDonnell & Miller FS4 Instruction Manual Features: For starting or stopping electrically operated equipment such as signal lights, alarms, motors,...

164400 McDonnell & Miller 193-7B LWCO & Pump CTRL. w/ Potentiometer. Information: McDonnell & Miller LWCO Instruction Manual Features: For commercial and industrial low or high pressure steam boilers Maintains consistent water...

120605 McDonnell & Miller FS8-WZ Flow Switch 1 NPT. *Please note image is generic. Information: Mcdonnell & Miller 120601 Instruction Manual Features: For general purpose applications with environmental exposure, or those requiring...

13-AV Armstrong SS Air Vent 1" NPT 309 psi. The Armstrong all-stainless steel guided lever air vents have been developed to provide positive venting of air/gases under pressure. For pressures to 600 psig (41 bar) or specific gravity down to 0...

304200 McDonnell & Miller Head Gasket. This Item Usually Ships The Same Day!

177251 McDonnell & Miller 157S-RLS-M-MD Hi Pressure Level Control. McDonnell & Miller 150S/157S Instruction Manual Specifications For boilers of any steaming capacity Monel bellows provides corrosion resistance Snap action switches for...

172813 McDonnell & Miller 157S-M-MD Hi Pressure Level Control. McDonnell & Miller 150S/157S Instruction Manual Features For boilers of any steaming capacity Model 175412 - 157S-M-MD Monel bellows provides corrosion resistance Snap...

173702 McDonnell & Miller Hi Pressure Level Control 157S-A. Information: 173702 McDonnell & Miller 150S/157S Instruction Manual Specifications For boilers of any steaming capacity Model 173702 - 157S-A Monel bellows provides corrosion...

 129802 McDonnell & Miller LWCO 42S-N Pump Controller. Instruction Manual For residential, commercial, and industrial low and medium pressure steam boilers with a separate water column For boilers of any steaming capacity Monel bellows...

 143700 McDonnell & Miller 64A Mechanical Low Water Cut Off. Mechanical LWCO For Steam Boilers. Mcdonnell & Miller LWCO Series 64 Instruction Manual Features: Optional manual reset is available For boilers of any steaming...

136000 McDonnell & Miller 51-S-2-M Mechanical Water Feeder. Information: Mcdonnell & Miller 136000 Series 51-S-2-M Instruction Manual Features: Proportional feed action Maximum water supply pressure 100 psi (7 kg/cm2) Maximum inlet...

176212 McDonnell & Miller Mechanical Water Feeder 47X-2. This Item Usually Ships The Same Day!

133400 McDonnell & Miller Mechanical Water Feeder 47-X. This Item Usually Ships The Same Day!

311200 - McDonnell & Miller 21-30 Replacement Float for 21. Click here for more info on Mcdonnell Miller Mechanical Level & Boiler Controls For boiler receiver tanks Float operated Proportional feed action Soft seat provides positive...

120150 McDonnell & Miller FS7-4EL - 1-1/4" Flow Switch With NEMA 7 & 9 Enclosure w/Extended Paddle & Paddle Arm 120150. McDonnell & Miller FS7 Overview McDonnell & Miller FS7 Instruction Manual Features: For hazardous...

McDonnell & Miller FS5-D-3/4 - 3/4 Flow Switch With/2 SPDT Switches 114763. McDonnell & Miller FS5 Instruction Manual Features: In-line configuration eliminates need for a pipe tee Sizes available: 3/4" NPT, 1" NPT Materials of...

Bell & Gossett TFI-4 Thermoflo Indicator 4" Sweat Part Number 140006 is an indicating flow meter for measuring the flow of heated or chilled water. Installed in each circuit of a hydronic system, it permits simple balancing to meet design flow...

140005 Bell & Gossett TFI-3 Thermoflo Indicator 3" Sweat Part Number 140005 is an indicating flow meter for measuring the flow of heated or chilled water. Installed in each circuit of a hydronic system, it permits simple balancing to meet design...

140004 Bell & Gossett TFI-2-1/2 Thermoflo Indicator 2-1/2" Sweat Part Number 140004 is an indicating flow meter for measuring the flow of heated or chilled water. Installed in each circuit of a hydronic system, it permits simple balancing to...

181405 McDonnell & Miller Relief Valve 250-3/4-40. Features and Benefits: For tanks and hydronic heating systems Protects against over-pressure Minimizes hammering with flash steam Low differential pressure – 3 psi (.21 kg/cm2) between...

The 109430 Bell & Gossett Z-6 ZoneTrol II provides DHW priority timer, post purge function and pump exercise into an economical and user-friendly package. Bell & Gossett’s ZoneTrol II is a ready to install controller for hydronic...