Product Overview

Pentair MasterTemp 400 (460737) – Premium 400,000 BTU Propane Gas Pool & Spa Heater
Engineered for high-performance heating with exceptional efficiency, the MasterTemp 400 Propane delivers fast, reliable warmth for large pools and spas. Built with Pentair’s proven technology, it provides the same heating power as the natural-gas model while operating cleanly on propane fuel — ideal for properties without natural-gas service.

• Heating Capacity: 400,000 BTU Input

• Fuel Type: Propane Gas

• Electrical: 120/240 V Single Phase, 60 Hz

• Weight: ≈ 140 lbs

• Warranty: 2 Years (when professionally installed)

Call-out Badges: Low NOx Certified • Eco-Select Choice • High Output Performance • Propane Fuel Ready

Ideal For

• Large residential pools or combination pool + spa setups

• Properties without natural-gas supply needing propane fuel compatibility

• Replacing older propane heaters with modern high-efficiency models

• Homeowners wanting fast heating with cleaner emissions and a compact design

Key Features

400,000 BTU High-Capacity Heating — Heats large pools and spas quickly and evenly for immediate comfort.
Why it matters: Perfect for extended swim seasons and larger installations.

Efficient Propane Combustion System — Precision-tuned for propane fuel, delivering consistent heat output and reduced fuel use.
Why it matters: Maximizes performance while keeping operating costs lower.

Corrosion-Resistant Composite Cabinet — Durable housing stands up to harsh outdoor conditions and prevents rust.
Why it matters: Extends lifespan and maintains a clean appearance.

Digital Display & Self-Diagnostics — Simple user interface for temperature control and system monitoring.
Why it matters: Streamlined setup and troubleshooting for professionals and homeowners alike.

Low NOx Emission Design — Meets strict air-quality standards without compromising heating performance.
Why it matters: Environmentally friendly operation with powerful results.

Benefits

• Fast Heat-Up Times: Quickly raises pool or spa temperature to desired level

• Propane Fuel Efficiency: Optimized burner system reduces fuel consumption

• Quiet Operation: Minimized noise for a peaceful backyard environment

• Durable Design: Built to withstand weather, moisture, and UV exposure

• Compact Footprint: Fits standard equipment pads for easy retrofit installation

Specs & What’s in the Box

Specifications

• Dimensions: 23″ W × 32.6″ D × 28″ H

• Weight: ≈ 140 lbs

• Materials: Composite cabinet with copper or cupro-nickel heat exchanger option

• Gas Connection: ¾″ NPT (propane rated)

• Electrical: 120/240 V single-phase connection

• Fuel Type: Propane Gas

In the Box

• Pentair MasterTemp 400 Propane Gas Heater (460737)

• User manual and installation guide

• Mounting hardware and fittings

Compatibility & Replacements

Works with: Large residential and light-commercial pools or spas requiring propane gas fuel
Replaces: Older Pentair MiniMax and other propane heaters in the 350–400 K BTU range
Not compatible with: Natural-gas systems (use model 460736) or ASME-certified installations (model 461059)

Trust Builders

• ⭐⭐⭐⭐⭐ Pentair’s most powerful propane heater for residential use

• Backed by a two-year limited warranty

• Supported through Pentair’s authorized dealer and service network

• Designed and assembled in the USA

Install Steps (Compact)

1. Turn off power and propane supply

2. Remove existing heater and prepare plumbing connections

3. Mount MasterTemp 400 level on pad and connect water and propane lines

4. Connect 120/240 V power and configure digital controls

5. Test for proper operation and verify ignition and heat output