McDonnell & Miller Parts & Controls

The D.B. Johnsen Company offers McDonnell & Miller products for numerous boiler room applications. Some common McDonnell & Miller parts and controls include:


Water Feeders: Float operated valve to add water to boiler or tank on drop of level below NWL.

Series 101-A, 47, 51, 53, 247, 21, 25, 551, 851, 47-2, 51-2, 53-2, 247-2


Low Water Cutoff (LWCO): Controls boiler feedwater levels and provides burner cutout functions.

Series: 63, 64, 764, 67, 69, 150, 157, 42, 93, 193, 194

See Also: National Board of Boiler & Pressure Vessel Inspectors explain importance of LWCO.


Switches: Included with water feeder or LWCO, provides burner cutout, feedwater pump control, or proportional level control.

Nos: 2, 5, 7-B, 11


Liquid Flow:

Series: FS4-3, FS4-3T, FS5, FS8-W, FS1, FS1-W, FS6, FS6-W


We also provide replacement gaskets, floats, switches, and other parts for all McDonnell & Miller products.

To request more information or to order McDonnell & Miller parts and controls, please call the D.B. Johnsen Company Parts Department between 8:00 AM - 4:30 PM EST at 1-800-442-1242 or click here to email us.