McDonnell & Miller (Xylem)
McDonnell & Miller at Cummins-Wagner
Boiler Safety Controls and Flow Switches for Reliable Operation
Cummins-Wagner proudly supplies McDonnell & Miller boiler controls and flow switches to customers across Pennsylvania and Maryland. A brand of Xylem, McDonnell & Miller is an industry leader in boiler protection, offering cutting-edge level controls, low water cut-offs, pump controllers, and flow switches for safe and efficient operation of steam and hot water systems.
Whether you’re managing a high-pressure commercial boiler or maintaining a process heating system, McDonnell & Miller products help ensure system safety, minimize downtime, and extend the life of your equipment.
Why Choose Cummins-Wagner for McDonnell & Miller?
- McDonnell & Miller distributor in PA and MD
- In-house boiler system and flow control experts
- Local inventory and fast access to OEM parts
- Installation support and troubleshooting services
- Assistance with control system upgrades and retrofits
Industries Served by McDonnell & Miller
- Commercial Buildings & Institutions
- Schools, Hospitals & Universities
- Industrial Boilers & Process Heating
- Food & Beverage Processing
- Pharmaceutical & Biotech
- Power Generation (Auxiliary Boilers)
- HVAC Systems
- Municipal Facilities
McDonnell & Miller Product Offerings
Low Water Cut-Offs
- Mechanical or electronic designs
- Protects against dry firing and overheating
- For steam and hot water boilers
- Models include Series 63, 67, 764, and GuardDog® Series
- Meets CSD-1 and ASME codes for boiler safety
Boiler Water Level Controls
- Maintains proper operating levels in steam boilers
- Single-function or dual-function (cut-off and feed pump control)
- Compatible with McDonnell & Miller pump controllers
- Models like Series 150 and 157 for high-pressure systems
Flow Switches (FS Series)
- Detects liquid flow in pipes and triggers safety shutoffs or alarms
- Brass, stainless steel, and cast iron options available
- FS4-3, FS1, and FS7 models suit HVAC, process cooling, and water circulation applications
- Adjustable sensitivity with paddle customization
Pump Controllers
- Starts and stops feedwater pumps based on boiler water levels
- Reduces pump wear by limiting cycling
- Models like Series 150S and 157S used in high-volume systems
- Designed for long service life and minimal maintenance
Electric Water Feeders
- Automatically adds water to steam boilers when low
- Models like Series 51 and 47-2 for residential and commercial use
- Ideal for unattended boiler rooms
Control Panels & Accessories
- Control boxes, time delays, switches, and test kits
- Retrofit kits and adapters available for legacy equipment
- Designed for easy installation and wiring
Local Support for Boiler Systems & Safety Controls
Cummins-Wagner provides full support for McDonnell & Miller installations in PA and MD, including:
✔ Boiler room assessments and product selection
✔ Installation guidance and field startup services
✔ Maintenance and periodic testing advice
✔ OEM replacement parts and retrofit components
✔ Upgrades for compliance with current safety codes
A Heritage of Boiler Control Innovation
McDonnell & Miller, founded in 1924 and now part of Xylem Inc., is known for its engineered solutions in boiler control and protection. With nearly a century of experience, they have set the standard in mechanical and electronic level detection for boilers, making them the trusted choice in HVAC, institutional, and industrial facilities.
Manufactured to strict performance and safety standards, McDonnell & Miller products are known for durability, easy installation, and code compliance, including ASME, UL, CSA, and IAPMO certifications.
Your Local McDonnell & Miller Distributor in PA & MD
Cummins-Wagner is the authorized distributor of McDonnell & Miller (Xylem) boiler controls and flow switches in Pennsylvania and Maryland, with service teams based in Elizabethtown, Annapolis Junction, and Salisbury.
- Maryland (including Washington DC, DE, Northern VA, and Eastern Panhandle of WV), with offices in Annapolis Junction and Salisbury, MD.
- Pennsylvania (serving Central and Eastern PA), with an office in Elizabethtown, PA.
Ready to Upgrade or Maintain Your Boiler Controls?
Contact Cummins-Wagner today to find the right McDonnell & Miller controls and flow switches to protect and optimize your boiler system.
FAQ: McDonnell & Miller Boiler Controls
What does a low water cut-off do?
- It prevents the boiler from firing when water levels are too low, protecting against overheating and damage.
Can McDonnell & Miller controls be used on high-pressure boilers?
- Yes. Many models are designed for high-pressure steam systems and are compliant with ASME code requirements.
Are both mechanical and electronic models available?
- Yes. McDonnell & Miller offers both types, allowing flexibility for traditional and modern systems.
How often should low water cut-offs be tested?
- Weekly testing is recommended to ensure safety and code compliance—Cummins-Wagner can help with testing protocols.
Do flow switches work in chilled water applications?
- Yes. FS Series flow switches are widely used in HVAC systems, including chilled water loops, condenser water, and hot water supply.
Can I retrofit an older boiler system with McDonnell & Miller controls?
- Absolutely. Cummins-Wagner can assist in selecting drop-in replacements or recommend modern alternatives.
What materials are flow switches made from?
- Depending on the application, brass, stainless steel, or cast iron models are available for compatibility and durability.
Are there automatic water feeders for unattended operation?
- Yes. Electric water feeders are designed for remote and automatic water addition.
Can these controls integrate with modern BAS systems?
- Many electronic models can interface with Building Automation Systems (BAS) through relay contacts or analog outputs.
Is local technical support available?
- Yes. Cummins-Wagner’s teams in PA and MD provide hands-on support, diagnostics, and parts availability.
Trust McDonnell & Miller for Proven Boiler Safety & Flow Control
Partner with Cummins-Wagner for expert product selection, code-compliant installation, and reliable local support for all McDonnell & Miller equipment.
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