Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

MCDONNELL 101A Water Feeder - Replacement HVACR Pumps, Valves & Tubing
MCDONNELLReplacement HVACR Pumps, Valves & Tubing

MCDONNELL 101A Water Feeder

MCDONNELL Replacement HVACR Pumps, Valves & Tubing. Specifications: Product Type: Water Feeder.

SKU 3G-OTH-79533

Also listed as: 101 A · 101-A

Brand
MCDONNELL
Item
101A Water Feeder
Category
Replacement HVACR Pumps, Valves & Tubing
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 — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

MCDONNELL
Manufacturer Part Number
101A
Product Type
Water Feeder

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

Product Description

MCDONNELL Replacement HVACR Pumps, Valves & Tubing. Specifications: Product Type: Water Feeder.

Frequently Asked Questions

What is the MCDONNELL & MILLER 101A water feeder used for?

The MCDONNELL & MILLER 101A water feeder automatically adds water to low-pressure steam or hot water heating systems when the water level drops below a set point. It is commonly used in commercial and industrial HVAC applications to maintain proper boiler water levels and prevent dry-firing.

What are the specifications of the MCDONNELL & MILLER 101A water feeder?

The MCDONNELL & MILLER 101A is a water feeder with manufacturer part number 101A. It is designed for replacement in HVACR pumps, valves, and tubing systems. For detailed technical specifications such as pressure ratings and connection sizes, consult the product datasheet or contact 3G Electric.

Where to buy the MCDONNELL & MILLER 101A water feeder worldwide?

3G Electric supplies the MCDONNELL & MILLER 101A water feeder to customers worldwide. As a global industrial equipment distributor, we handle full logistics, customs clearance, and delivery to your location. Contact our team to place an order or request a quote for international shipping.

How to install the MCDONNELL & MILLER 101A water feeder?

Install the MCDONNELL & MILLER 101A water feeder by first isolating the boiler and draining the system. Mount the feeder in the correct orientation per the manufacturer's instructions, connect the supply line and electrical wiring, then test for leaks and proper operation. Always follow local codes and safety guidelines.

Used in

Common applications for MCDONNELL
Steam boiler low-water cutoff — McDonnell & Miller 61 level control
Condensate receiver level monitoring — McDonnell & Miller RS-4-BR-1 4-level sensor
HVACR pump suction filtration — McDonnell & Miller 340700 strainer basket assembly
Flow switch head replacement — McDonnell & Miller 63-HD head mechanism
Boiler control circuit safety — McDonnell & Miller 7-BM electrical switch with manual reset
Field servicing of flow switches — McDonnell & Miller 310452 cartridge kit

MCDONNELL Products

3G Electric supplies MCDONNELL replacement hvacr pumps, valves & tubing. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Pump Accessories Valves & Regulation Motors & Drives All Products

Compatible alternatives & equivalents

Cross-referenced by specification & description
MCDONNELL & MILLER Water Feeder: 51-S-2-HD Mfr Part #
MCDONNELL
MCDONNELL & MILLER Water Feeder: 51-S-2-HD Mfr Part #
MCDONNELL & MILLER Water Feeder: 51-B-2M Mfr Part #
MCDONNELL
MCDONNELL & MILLER Water Feeder: 51-B-2M Mfr Part #
MCDONNELL & MILLER Water Feeder: 51-S-HD Mfr Part #
MCDONNELL
MCDONNELL & MILLER Water Feeder: 51-S-HD Mfr Part #
Automatic water feeder for maintaining water levels in hydronic heating systems. Designed for replacement in HVACR pumps, valves, and tubing applications. Helps prevent low-water conditions in boilers
MCDONNELL
Automatic water feeder for maintaining water levels in hydronic heating systems. Designed for replacement in HVACR pumps, valves, and tubing applications. Helps prevent low-water conditions in boilers
MCDONNELL & MILLER Strainer Assembly: 347100 Mfr Part #
MCDONNELL
MCDONNELL & MILLER Strainer Assembly: 347100 Mfr Part #
MCDONNELL & MILLER High Capacity Feeder: 51-S Mfr Part #
MCDONNELL
MCDONNELL & MILLER High Capacity Feeder: 51-S Mfr Part #

More from MCDONNELL

View all MCDONNELL parts
This electrical switch is a replacement component for HVACR pumps, valves, and tubing systems. It is compatible with manufacturer part number 165300. Used to monitor fluid flow or level, it serves as a control or safety switch in commercial and industrial heating and cooling applications
MCDONNELL
This electrical switch is a replacement component for HVACR pumps, valves, and tubing systems. It is compatible with manufacturer part number 165300. Used to monitor fluid flow or level, it serves as a control or safety switch in commercial and industrial heating and cooling applications
Electrical switch for use in HVACR pumps, valves, and tubing systems. Compatible with manufacturer part number 110800. Suitable for controlling or monitoring fluid flow and system operation in commercial and industrial heating, ventilation, air conditioning, and refrigeration applications
MCDONNELL
Electrical switch for use in HVACR pumps, valves, and tubing systems. Compatible with manufacturer part number 110800. Suitable for controlling or monitoring fluid flow and system operation in commercial and industrial heating, ventilation, air conditioning, and refrigeration applications
Level control head mechanism for monitoring and regulating liquid levels in HVAC and boiler systems. Activates alarms or shutoffs to prevent dry firing or overflow. Suitable for use in steam boilers and hot water systems
MCDONNELL
Level control head mechanism for monitoring and regulating liquid levels in HVAC and boiler systems. Activates alarms or shutoffs to prevent dry firing or overflow. Suitable for use in steam boilers and hot water systems
Stainless steel liquid level control probe for detecting and regulating water or liquid levels in boilers, tanks, and receivers. Provides on/off control for pumps, valves, and alarms in HVAC and industrial systems. Replacement component for HVACR pumps, valves, and tubing systems
MCDONNELL
Stainless steel liquid level control probe for detecting and regulating water or liquid levels in boilers, tanks, and receivers. Provides on/off control for pumps, valves, and alarms in HVAC and industrial systems. Replacement component for HVACR pumps, valves, and tubing systems
Replacement resistor slide wire assembly for HVACR pumps, valves, and tubing. Compatible with manufacturer part number 93. Used in industrial equipment applications requiring precise resistance adjustment
MCDONNELL
Replacement resistor slide wire assembly for HVACR pumps, valves, and tubing. Compatible with manufacturer part number 93. Used in industrial equipment applications requiring precise resistance adjustment
Low water cut-off head mechanism for steam boilers and hot water systems. Automatically interrupts burner operation when water level drops below safe threshold to prevent dry-fire damage. Suitable for replacement in commercial and industrial HVACR pump, valve, and tubing assemblies
MCDONNELL
Low water cut-off head mechanism for steam boilers and hot water systems. Automatically interrupts burner operation when water level drops below safe threshold to prevent dry-fire damage. Suitable for replacement in commercial and industrial HVACR pump, valve, and tubing assemblies
Level control feeder for automatic water level maintenance in boiler systems. Used in HVAC and steam boiler applications to prevent low-water conditions. Part number 51-2
MCDONNELL
Level control feeder for automatic water level maintenance in boiler systems. Used in HVAC and steam boiler applications to prevent low-water conditions. Part number 51-2
This low water cut-off is a safety device for steam and hot water boilers. It automatically shuts off the burner when water level drops below a safe point, preventing dry-fire damage. Used in commercial and industrial heating systems
MCDONNELL
This low water cut-off is a safety device for steam and hot water boilers. It automatically shuts off the burner when water level drops below a safe point, preventing dry-fire damage. Used in commercial and industrial heating systems