WHWL Hot Water Pumps Series

takes high-temperature cleaning to the next level with engineering built for continuous 180°F inlet water. With nickel-plated brass heads, bronze connecting rods, and stainless-steel plungers, WHWL pumps deliver the durability, pressure stability, and throughput industrial wash sites demand—all while staying serviceable with readily available AR kits.
Whether you’re degreasing fleet equipment, sanitizing food plants, or running high-volume bays in a commercial car wash, the WHWL platform pairs high flow with heat tolerance so you can clean faster, lift heavy soils, and turn vehicles or production lines more quickly.

Why WHWL Hot Water Pump changes the game
Hot water dramatically improves cleaning efficiency:

• Cuts oils and grease by lowering viscosity so detergents work faster.
• Shortens dwell time—heat accelerates chemical reactions and reduces scrubbing.
• Improves rinse results by preventing re-deposition and streaking.
• Reduces detergent use in many jobs, saving cost and discharge load.

The catch: heat is hard on pumps. That’s where WHWL construction—plated heads, bronze rods, stainless plungers, and generous crankcase capacity—keeps your system running shift after shift.

WHWL Hot Water Pump Technical highlights (series)

• Max inlet temperature: 180°F continuous hot water
• Inlet / discharge: 3/4″ F inlet, 3/8″ F discharge
• Crankcase oil capacity: 32 oz for cooler, longer running
• Construction: Nickel-plated brass head, bronze rods, stainless-steel plungers, aluminum components
• Serviceability: Valve, piston, seal, and guide kits available for quick rebuilds

WHWL Hot Water Pump model lineup (quick chooser)
WHWL38.15N

• Flow / pressure: 10.0 GPM @ 2,200 PSI
• EBHP: 15.1 HP
• Speed: 1450 RPM
• Bore / stroke: 37 × 28 mm
• Weight: ~15 lb

Best for: Medium-to-large hot-water systems in fleet wash bays, municipal cleaning, and equipment sanitation where hours are long and consistency matters.
Power planning: For a comfortable margin, pair with a 15–20 HP electric motor (or gas engine equivalent), accounting for ambient temperature, elevation, hose length, and accessories that introduce pressure loss.

WHWL50.15N

• Flow / pressure: 13.2 GPM @ 2,200 PSI
• EBHP: 19.9 HP
• Speed: 1450 RPM
• Bore / stroke: 37 × 28 mm
• Weight: ~19.4 lb

Best for: High-flow hot-water applications where throughput is king—commercial car washes, large food processing lines, and industrial manufacturing where faster rinse-off equals more uptime.
Power planning: Target 20–25 HP electric. Ensure plumbing and filtration are sized for the higher inlet demand to prevent starvation and cavitation.

WHWL50.20NB

• Flow / pressure: 13.2 GPM @ 3,000 PSI
• EBHP: 25.5 HP
• Speed: 1450 RPM
• Bore / stroke: 37 × 28 mm
• Weight: ~19.4 lb

Best for: Heavy equipment cleaning, large-scale agriculture, and marine/shipyard work where you need both volume and pressure at elevated temperatures.
Power planning: Plan 25–30 HP electric (or equivalent). Verify unloader rating and hose/fixture pressure ratings at temperature.

WHWL Hot Water Pump System design essentials (do it right once)
1) Inlet plumbing and supply
 Hot water carries less dissolved oxygen but can flash to steam if restricted. Keep suction lines short, straight, and full-bore. Use full-flow valves and avoid sharp elbows. Confirm your heater or plate exchanger can satisfy 10–13.2 GPM at 180°F without temperature sag.
2) Filtration
 Use an oversized in-line inlet filter to protect valves and seals from fines, especially if you run reclaim water. Hot water plus grit will score seats and accelerate wear.
3) Unloader and bypass
 Mount the unloader close to the pump. Route bypass to tank (preferred on hot water) so you aren’t recirculating heat into the inlet. Add a thermal relief valve as cheap insurance during idle periods.
4) Hoses and fittings
 Confirm all high-pressure components are rated for your PSI at temperature. Seal materials change properties when hot; choose components with Viton or other high-temp elastomers where appropriate.
5) Electrical and mechanical drive
 At 1450 RPM, these pumps are naturals for belt-drive on 4-pole motors or direct-drive on matched gearmotors. Size sheaves for correct ratio, guard the drive, and maintain belt tension to reduce bearing loads.

WHWL Hot Water Pump Maintenance & service (keep uptime high)
AR’s service ecosystem makes hot-water maintenance predictable:

• Valves (AR2780): Stainless valve sets restore crisp sealing and pressure recovery.
• Pistons 28 (AR1849): Rugged piston assemblies for high-temp duty.
• Water seals 28 (AR2562): Viton-based seals that tolerate heat and chemicals.
• Oil seals (AR2873): Keep the crankcase clean and dry under continuous duty.
• Support rings 28 (AR2561): Reinforced to stabilize seal geometry and extend life.

Best practices

• First oil change around 50 hours, then per AR guidance; watch for milky oil (water intrusion).
• Flush detergents with clean water at end of shift.
• Inspect for damp joints under pressure; any weep suggests O-ring or seal attention.
• Listen for pulsation changes—often an early sign that valves need service.
• Winterize with pump saver if storage temps can drop below freezing.

WHWL Hot Water Pump Applications that benefit most from WHWL

• Fleet & transit centers: Hot-water degreasing, de-icing residue, brake dust removal.
• Agricultural facilities: Sanitation of barns, parlors, pens, and food-contact surfaces.
• Industrial plants: Oils, cutting fluids, and process residues on machinery and floors.
• Commercial car wash systems: High-volume bays where speed and finish matter.
• Food processing & packing: Sanitation programs working toward USDA-style compliance.

Why choose WHWL for hot-water duty

• High flow capacity up to 13.2 GPM to feed multiple tools and speed rinsing.
• Heat resistance with continuous 180°F inlet for real hot-water cleaning.
• Pressure flexibility from 2,200 to 3,000 PSI to match soil load and tooling.
• Industrial durability via nickel-plated heads, bronze rods, and stainless plungers.
• Service support with standard AR repair kits that keep lifecycle cost in check.

WHWL Hot Water Pump The bottom line
If your operation lives in the hot-water lane, the AR WHWL Series gives you the blend of temperature tolerance, volume, and pressure that converts labor hours into clean equipment and compliant facilities. Choose WHWL38.15N for dependable medium-to-large systems, WHWL50.15N when maximum throughput is the bottleneck, and WHWL50.20NB when only 13.2 GPM at 3,000 PSI will do. Pair the pump with correctly sized power, generous filtration, and smart bypass routing, and you’ll have a hot-water workhorse that runs cool, cleans fast, and stays in the field.

For additional industry standards and technical resources, visit: https://www.pumps.org/