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Mcdonnell & Miller

Radiant Heat & Heating Supplies

Whether it's radiant heat, baseboard heating, hydronic heating, steam, electric or forced air heating, find all of the heating supplies to keep your home comfortable & warm.

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Product Specifications
Application:	Steam Boilers
Type:	Electronic
	Float-Style
Max Vessel Pressure:	15 psi
Voltage:	120v
Max Inlet Water Temp (F):	120°F
Max Ambient:	100°F
Height:	6.25"
Width:	2.875"

WFE-120V, Uni-Match Universal Water Feeder
(120V)

SKU: 169560
Brand: Mcdonnell & Miller

In Stock!

46 Avail (Ships in 24-48 Hrs)

$181.49 / each

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Product Specifications
Application:	Replacement Part
Accessory For:	69 Series

69-113, O-Ring for 69

SKU: 318826
Brand: Mcdonnell & Miller

In Stock!

6 Avail (Ships in 24-48 Hrs)

$3.15 / each

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Product Specifications
Connection Size: 1-1/4"

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FS7-4DS, 1-1/4" Flow Switch w/ Stainless Steel body w/ 2 SPDT switches
- SKU: 119760
- Brand: Mcdonnell & Miller
In Stock!
6 Avail (Ships in 24-48 Hrs)
$520.95 / each

Free Shipping

Product Specifications
Connection Size:	1-1/4"

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Product Specifications
Application:	Steam Boilers
Type:	Electronic
Reset Type:	Manual
Max Ambient:	120°F
Voltage:	120v
Sensitivity:	20000 ohms
Electrical Ratings (AFL):	7.2 A @ 120 VAC
	3.6 A @ 240 VAC
Electrical Ratings (ALR):	43.2 A @ 120 VAC

750-HW-MT-120, Electronic Reset High Water Cutoff
(120V)

SKU: 176236
Brand: Mcdonnell & Miller

In Stock!

1 Avail (Ships in 24-48 Hrs)

$102.75 / each

193-B, Combo Low Water Cut-Off & Pump Controller w/ #5 Switch w/ Alternate Tappings (Steam)

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Product Specifications
Application:	Steam Boilers
Switch:	#5
Max Pressure:	150 psi
Type:	Combo
Features:	w/ Water Column
	Alternate Tappings
Reset Type:	Automatic
Length:	20-1/2"
Width:	6-3/4"

193-B, Combo LWCO Pump Ctrl w/ #5 Switch
w/ Alt. Tap (Steam)

SKU: 163600
Brand: Mcdonnell & Miller

In Stock!

1 Avail (Ships in 24-48 Hrs)

$854.45 / each

Free Shipping

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Product Specifications
Application:	Replacement Part
Accessory For:	150 Series
	157 Series
	93 Series
	193 Series

150-14, Gasket for Mcdonnell & Miller Series 150 LWCO

SKU: 325400
Brand: Mcdonnell & Miller

In Stock!

28 Avail (Ships in 24-48 Hrs)

$4.25 / each

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Product Specifications
Application:	Replacement Part
Accessory For:	64 Series
	67 Series
	61 Series
	69 Series
	70 Series
	764 Series
	767 Series
Switch:	Millivolt

11MV, MV Switch for 61
64, 67, 69, 70, 764, 767

SKU: 309200
Brand: Mcdonnell & Miller

Usually Ships 7-10 Days

$102.85 / each

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Product Specifications
Application:	Replacement Part
Accessory For:	67-G

6667-MV, Replacement Head Mechanism for 67-G

SKU: 153850
Brand: Mcdonnell & Miller

In Stock!

10 Avail (Ships in 24-48 Hrs)

$168.75 / each

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Product Specifications
Application:	Replacement Part
Accessory For:	AF3 Series

AF3-122, Paddle Kit
for AF3

SKU: 301450
Brand: Mcdonnell & Miller

Usually Ships 7-10 Days

$12.95 / each

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Product Specifications
Application:	Replacement Part
Accessory For:	25A Series
Max Pressure:	100 psi
Max Vessel Pressure:	35 psi
Max Inlet Water Temp (F):	120°F

25-A-HD, Head Assembly for 25-A Water Feeder

SKU: 127100
Brand: Mcdonnell & Miller

In Stock!

2 Avail (Ships in 24-48 Hrs)

$479.25 / each

Free Shipping

157S-A, Float Type, Combo LWCO & Pump Controller w/ Water Column, w/ Alternate Tappings (Steam)

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Product Specifications
Application:	Steam Boilers
Reset Type:	Automatic
Max Pressure:	150 psi
Switch:	SPST
	SPDT
Type:	Combo
	Float-Style
Features:	w/ Water Column
	Alternate Tappings

157S-A, Float Type, Combo LWCO Pump Ctrl w/ WC
w/ Alt. Tap (Steam)

SKU: 173702
Brand: Mcdonnell & Miller

In Stock!

2 Avail (Ships in 24-48 Hrs)

$579.95 / each

Free Shipping

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Product Specifications
Connection Size: 1-1/4"

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FS7-4L, 1-1/4" w/ Extended Paddle & Paddle Arm
- SKU: 119900
- Brand: Mcdonnell & Miller
In Stock!
3 Avail (Ships in 24-48 Hrs)
$285.15 / each

Product Specifications
Connection Size:	1-1/4"

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Product Specifications
Pressure Set Point:	125 psi
Capacity:	3735000 BTU/hr

250-1-125, Relief Valve
1" NPT, 125 psi
(8.8 kg/cm2)

SKU: 182525
Brand: Mcdonnell & Miller

In Stock!

1 Avail (Ships in 24-48 Hrs)

$119.65 / each

469, Float Type Low Water Cut-off, 1-3/16" Insertion (Steam)

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Product Specifications
Application:	Steam Boilers
Switch:	Dual Precision Switches
Max Pressure:	20 psi (steam)
Type:	Float-Style
Insertion Length:	1-3/16"
Reset Type:	Automatic
Mount:	on 2-1/2" NPT Boiler Side Tappings
Electrical Ratings (ALR):	22.2 A @ 240 VAC
Electrical Ratings (AFL):	7.4 A @ 120 Vac

469, Float Type LWCO
1-3/16" Insertion (Steam)

SKU: 155500
Brand: Mcdonnell & Miller

In Stock!

3 Avail (Ships in 24-48 Hrs)

$188.95 / each

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Product Specifications
Application:	Replacement Part
Accessory For:	FS7-4W Series

FS7W-43, Replacement Gasket for Flow Switch

SKU: 307200
Brand: Mcdonnell & Miller

Usually Ships 7-10 Days

$26.25 / each

169MV, Float Type Low Water Cut-Off, 3-1/8" Insertion Length with Millivolt Switch (Steam)

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Product Specifications
Application:	Steam Boilers
Switch:	Millivolt
Max Pressure:	20 psi (steam)
Type:	Float-Style
Insertion Length:	3-1/8"
Reset Type:	Automatic
Mount:	2-1/2" NPT Boiler Side Tappings
Electrical Ratings (AFL):	7.4 A @ 120 VAC
Electrical Ratings (ALR):	22.2 A @ 240 VAC

169MV, Float Type LWCO
3-1/8" Insertion Length
w/ mV Switch (Steam)

SKU: 155150
Brand: Mcdonnell & Miller

Usually Ships 7-10 Days

$178.85 / each

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Product Specifications
Pressure Set Point:	45 psi
Capacity:	5500000 BTU/hr

250-2-45, Relief Valve
2" NPT, 45 psi (3.2 kg/cm2)

SKU: 183225
Brand: Mcdonnell & Miller

Usually Ships 7-10 Days

$499.49 / each

Free Shipping

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Product Specifications
Pressure Set Point:	125 psi
Capacity:	2535000 BTU/hr

250-3/4-125, Relief Valve 3/4" NPT, 125 psi
(8.8 kg/cm2)

SKU: 181825
Brand: Mcdonnell & Miller

Usually Ships 7-10 Days

$66.59 / each

158S-HD, Head Assembly for 158S Low Water Cutoff

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Product Specifications
Application:	Replacement Part
Accessory For:	158S Series
Features:	Snap Switch

158S-HD, Head Assembly for 158S LWCO

SKU: 178602
Brand: Mcdonnell & Miller

In Stock!

1 Avail (Ships in 24-48 Hrs)

$472.35 / each

Free Shipping

157S-RB-MD, Float Type, Combo LWCO & Pump Controller w/ Water Column, w/ Maximum Differential

View Specs

Product Specifications
Application:	Steam Boilers
Reset Type:	Automatic
Max Pressure:	50 psi
Switch:	SPST
	SPDT
Type:	Float-Style
	Combo
Features:	w/ Max Differential
	w/ Water Column

157S-RB-MD, Float Type Combo LWCO Pump Ctrl
w/ WC & Max. Diff.

SKU: 176601
Brand: Mcdonnell & Miller

In Stock!

1 Avail (Ships in 24-48 Hrs)

$600.85 / each

Free Shipping

81 - 100 of 334

More about Mcdonnell & Miller

For over 80 years, McDonnell & Miller has been an industry leader in the engineering and manufacturing of flow switches, low water cut-offs, water feeders, etc. Trust McDonnell & Miller for everything you need to move water.

Air Eliminators	Nipples
Air Valves	Pipe Insulation
Aquastats & Wells	Pressure Valves
Baseboard Heaters	Pumps & Flanges
Boilers	Radiant Heat
Expansions Tanks	Radiator Valves
Fittings	Relief Valves
Flow Controls Valves	Switching Relays
Flow Switches	Tekmar Controls
Gas Valves	Temperature Controllers
Gauges	Thermocouples
Heating Specialties	Thermostats
Kickspace Heaters	Transformers
Low Water Cutoffs	Water Feeders
Mixing Valves	Zone Valves & Controls

Access Doors	PEX Plumbing
Backflow Preventers	Plumbing Specialties
Chemicals & Compounds	Pumps
Expansion Tanks	Solder
Faucets & Sinks	Stops & Risers
Fittings	Tools
Flush Valves	Toilet Parts
Grease Traps	Tub & Shower Products
Outlet Boxes	Tubular Goods & P-Traps
Nipples	Valves
Pipe Hangers	Water Filters
Pipe Insulation	Water Heaters

Air Cleaners	HVAC Controls
Air Conditioners	Line Sets
AC Install Parts	Mini-Split Air Conditioners
Condensate Pumps	Replacement Parts
Dampers	Registers & Grilles
Dehumidifiers	Replacement Filters
Filter Driers	Thermostats
Flex Duct	Tools
Humidifiers	Ventilation Fans

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Radiant Heat & Heating Supplies

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