Water Feeders

Water feeders add make-up water to compatible boiler, hydronic heating, steam, hot-water, and boiler receiver tank systems. Facility teams, boiler operators, and heating professionals use these products to manage water levels, replenish water when pressure falls, or support controlled water addition in commercial and residential heating applications.

Product Display:
Helpful Buying Guide

Choose a Water Feeder for Your Heating System

Water feeders in this category serve several distinct heating-system applications. Start by matching the feeder to a boiler receiver tank, low-pressure steam or hot-water boiler, or hydronic heating system. Then compare the feed-control method, connection or mounting requirements, pressure limits where stated, and the monitoring or low-water cutoff features needed for the application.

Visual Guide

Popular examples in this category

Series 551-S Make-Up Water FeederSeries 551-S Make-Up Water FeederWBB9160291/2 in. NPT Hydronic Heating Pressure Reducing Valve1/2 in. NPT Hydronic Heating Pressure Reducing ValveWBB1529622Series 21 Make-Up Water Feeder for Boiler Receiver TanksSeries 21 Make-Up Water Feeder for Boiler Receiver TanksWBB916027Mechanical Water Feeder with Low-Water Cutoff Switch - 16 W x 10-3/8 in H x 12 in DMechanical Water Feeder with Low-Water Cutoff Switch - 16 W x 10-3/8 in H x 12 in DWBB916077
Use Cases

Match the feeder to the system

Options are represented for steam separators, receivers, tanks, boiler receiver tanks, low-pressure steam and hot-water boilers, boiler systems, and hydronic heating systems.

How to Choose

Compare feed control and installation details

Choose among proportional, mechanical, float-operated, pressure-reducing, and commercial controlled-feed designs. Confirm stated connections, mounting arrangements, pressure settings, and operating limits.

Applications

Support boiler water-level and pressure management

Products can provide make-up water, maintain a selected hydronic system pressure, manage boiler water levels, or provide controlled feed action as tank conditions change.

Additional Info

Consider monitoring and protection features

Available features include low-water cutoff switches, integrated strainers, replaceable cartridge valves, feed delays, manual feed controls, meters, displays, and digital feed counters.

10–50 psiAdjustable hydronic range

Stated fill-pressure range on one pressure reducing valve.

12 psiFactory setting

Initial setting stated for one hydronic pressure reducing valve.

150 psiMaximum supply pressure

Stated for one boiler receiver-tank feeder.

1–5 gal.Selectable feed amount

Available setting range on one boiler water feeder.

Comparison Guide

Water Feeder Types at a Glance

Use this overview to compare the product types and capabilities represented in the category.

Product typeBest-matched applicationRepresented features to compare
Receiver-tank make-up water feederSteam separators, receivers, tanks, and boiler receiver tanksProportional or float-operated feed; direct mounting on one model; soft seat; stated supply and vessel limits on selected models.
Mechanical boiler water feederLow-pressure steam and hot-water boilersProportional cold-water feed; low-water cutoff functionality on selected models; replaceable or quick-change valve and integrated strainer.
Controlled boiler water feederBoiler systems receiving a feed signal or requiring operator controlFeed delay; selectable or programmable feed amount; manual feed; monitoring indicators, counters, meter, or display on selected models.
Hydronic pressure controlHydronic heating systems and boiler piping systemsAutomatic replenishment; adjustable or maintained system pressure; fast fill or manual purge features on selected models.
Planning Guide

Plan the right fit before choosing

Select by system type

Identify the heating application first

Receiver-tank feeders are represented in proportional and float-operated designs. Low-pressure steam and hot-water boiler options include mechanical feeders, including versions with low-water cutoff switches. Hydronic heating choices include a pressure reducing valve and a dual control regulator and relief valve.

  • For boiler receiver tanks, compare direct-mount, proportional-feed, and float-operated options.
  • For low-pressure boilers, compare mechanical feed models and whether low-water cutoff functionality is included or can be added.
  • For hydronic systems, compare adjustable pressure control, automatic replenishment, and stated NPT connection details.
Compare control and maintenance features

Choose the level of control and visibility needed

Mechanical and proportional-feed models provide cold-water or water feed action in response to system needs. Other options provide adjustable feed delays, selectable or programmable feed amounts, manual feed buttons, operating-mode displays, and added feed-cycle protections. Several feeder assemblies also include strainers and cartridge valves designed for replacement.

  • A feed delay can allow condensate time to return before a feed cycle begins.
  • Manual feed buttons provide on-demand water feeding on applicable models.
  • Digital counters and make-up water meters help track water added to a boiler system.
  • Quick-change or replaceable cartridge valves are available on selected mechanical and make-up water feeders.
Verify fit and stated limits

Check connections, mounting, and operating values

Connection and mounting details vary among the represented products. Examples include 1/2 in. NPT, 3/4 in. NPT, and 1/2-inch sweat connections, as well as a six-hole flange on one receiver-tank feeder. Where operating values are stated, compare them directly with the intended installation.

  • One hydronic pressure reducing valve has a 10 to 50 psi adjustable setting and is factory-set at 12 psi.
  • A receiver-tank feeder is stated for water supply pressures up to 150 psi, inlet water temperatures up to 120°F, and vessel pressures up to 35 psi.
  • A float-operated receiver-tank feeder has a stated 100 psi supply rating.
  • One make-up water feeder has a 75 psi maximum water supply pressure.
FAQ

Common questions before buying

What systems can water feeders support?

The represented products are used with boiler receiver tanks, steam separators, receivers, tanks, low-pressure steam and hot-water boilers, boiler systems, and hydronic heating systems.

What is the difference between a mechanical and a controlled boiler water feeder?

Mechanical models provide proportional feed action and may include a low-water cutoff switch. Controlled boiler feeders can add features such as adjustable feed delay, selectable feed amount, manual feed, and feed monitoring.

Are low-water cutoff features available?

Yes. Several mechanical water feeders include a low-water cutoff switch, and one mechanical feeder can be upgraded with a No. 2 switch to add low-water cutoff functionality.

Which connection types are represented?

Stated connection options include 1/2 in. NPT, 3/4 in. NPT, and 1/2-inch sweat connections. One receiver-tank feeder uses a six-hole mounting flange.

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