We ship to the Philippines — door-to-door, customs and logistics handled by 3G Electric

Mcdonnell & Miller Series 21/221 Make-Up Water Feeders
Mcdonnell & MillerWater Feeders

Mcdonnell & Miller Series 21/221 Make-Up Water Feeders

McDonnell & Miller Water Feeders.

SKU 3G-OTH-02728

Also listed as: 21221 · 21 221 · 21-221

Brand
Mcdonnell & Miller
Item
Series 21/221 Make-Up Water Feeders
Category
Water Feeders
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — the Philippines

Delivery
5–8 business days door-to-door; Bureau of Customs clearance typically 2–4 business days.
Payment
Invoicing in PHP or USD. Bank transfer and corporate PO accepted.
Ships to
Manila, Quezon City, Cebu, Davao, Batangas

Technical Documents

No technical documents available for this product.
Request documentation
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

Mcdonnell & Miller Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

McDonnell & Miller Water Feeders.

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

Frequently Asked Questions

What is the McDonnell & Miller 21/221 water feeder used for?

The McDonnell & Miller 21/221 water feeder is designed for boiler receiver tanks to automatically maintain proper water levels. Its direct mounting eliminates the need for equalizing connections, and the proportional feed action ensures precise water addition, making it ideal for commercial and industrial steam boiler systems.

What are the specifications of the McDonnell & Miller 21/221 water feeder?

The McDonnell & Miller 21/221 water feeder features a mounting flange with six 7/16-inch bolt holes for direct installation on boiler receiver tanks. It provides proportional feed action to regulate water flow without requiring equalizing connections. For detailed technical specifications, consult the manufacturer's datasheet.

Where to buy the McDonnell & Miller 21/221 water feeder in Singapore?

You can source the McDonnell & Miller 21/221 water feeder through 3G Electric in Singapore. We handle logistics, customs clearance, and delivery to your facility. Contact our team for a quotation and lead time on this boiler component.

How to install the McDonnell & Miller 21/221 water feeder?

Install the McDonnell & Miller 21/221 water feeder by bolting its flange directly to the boiler receiver tank using the six 7/16-inch bolt holes. Ensure the tank opening matches the flange pattern. No equalizing connections are needed. Follow standard boiler safety procedures and consult a qualified technician for proper setup.

Used in

Common applications for Mcdonnell & Miller
Steam boiler low-water cutoff — McDonnell & Miller inline flow switches (e.g., FS-1) for automatic burner shutdown
Cooling water flow monitoring — McDonnell & Miller insertion-style switches (e.g., FS4-3D) in large-diameter pipes
Hazardous-area process lines — McDonnell & Miller FS7-4E with NEMA 7/9 enclosure for Class I, Div 1 locations
HVAC chilled water systems — McDonnell & Miller FS6-1 inline switch for pump flow verification
Industrial wastewater treatment — McDonnell & Miller FS4-3S stainless steel switch for corrosive fluid flow detection
Boiler feedwater control — McDonnell & Miller FS8-WJ with BSP connections for international installations

Mcdonnell & Miller Products

3G Electric supplies Mcdonnell & Miller water feeders. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion Pumps & Compressors Spare Parts All Products

Compatible alternatives & equivalents

Cross-referenced by specification & description
For boiler receiver tanks Float operated Proportional feed action Soft seat provides positive seal Seal between float chamber and valve chamber is not
McDonnell & Miller
For boiler receiver tanks Float operated Proportional feed action Soft seat provides positive seal Seal between float chamber and valve chamber is not
For mounting in 21 2 NPT boiler side tappings Insertion lengths available in 13 16 41 8 (30-105mm) Packless
McDonnell & Miller
For mounting in 21 2 NPT boiler side tappings Insertion lengths available in 13 16 41 8 (30-105mm) Packless
For high capacity [up to 35,000 sq. ft. (3250m 2 )] low pressure steam and hot water boilers with cold water feed
McDonnell & Miller
For high capacity [up to 35,000 sq. ft. (3250m 2 )] low pressure steam and hot water boilers with cold water feed
Field-adjustable dwell-feed cycles Multi-color LED status indicator Manual feed button Hard-stop limit to minimize chances of flooding the boiler Compatible with
McDonnell & Miller
Field-adjustable dwell-feed cycles Multi-color LED status indicator Manual feed button Hard-stop limit to minimize chances of flooding the boiler Compatible with
21 2 NPT body tapping for side mounting on boilers Lever-operated, full port ball valve for easy blow down Adjustable BX outlet for easy
McDonnell & Miller
21 2 NPT body tapping for side mounting on boilers Lever-operated, full port ball valve for easy blow down Adjustable BX outlet for easy

More from McDonnell & Miller

View all McDonnell & Miller parts
For low pressure steam boilers with cold water feed Eliminates necessity to manually add water to the boiler Can be used with mechanical or electronic low water
McDonnell & Miller
For low pressure steam boilers with cold water feed Eliminates necessity to manually add water to the boiler Can be used with mechanical or electronic low water
For low pressure steam and hot water boilers larger than 5,000 sq. ft. (465m2) with hot or cold water feed
McDonnell & Miller
For low pressure steam and hot water boilers larger than 5,000 sq. ft. (465m2) with hot or cold water feed
For steam and hot water boilers with cold water feed Continuous maintenance of minimum safe water level, independent of electrical service Proportional feed
McDonnell & Miller
For steam and hot water boilers with cold water feed Continuous maintenance of minimum safe water level, independent of electrical service Proportional feed
For steam and hot water boilers with cold water feed Continuous maintenance of minimum safe water level and independent of electrical service Proportional feed
McDonnell & Miller
For steam and hot water boilers with cold water feed Continuous maintenance of minimum safe water level and independent of electrical service Proportional feed
For receiver tanks in commercial or industrial applications Mounts directly on the receiver, eliminating need for equalizing connections Quick-change replaceable
McDonnell & Miller
For receiver tanks in commercial or industrial applications Mounts directly on the receiver, eliminating need for equalizing connections Quick-change replaceable
For receiver tanks in commercial or industrial applications Mounts directly on the receiver, eliminating need for equalizing connections Quick-change replaceable
McDonnell & Miller
For receiver tanks in commercial or industrial applications Mounts directly on the receiver, eliminating need for equalizing connections Quick-change replaceable
For low pressure steam and hot water boilers larger than 5,000 sq. ft. (465m 2 ) capacity with cold water feed Quick-change replaceable cartridge valve and
McDonnell & Miller
For low pressure steam and hot water boilers larger than 5,000 sq. ft. (465m 2 ) capacity with cold water feed Quick-change replaceable cartridge valve and
For applications where water is added to steam separators, receivers, tanks, or other vessels Proportional feed action Quick-change replaceable cartridge valve
McDonnell & Miller
For applications where water is added to steam separators, receivers, tanks, or other vessels Proportional feed action Quick-change replaceable cartridge valve