Pentair Mastertemp 400K BTU Heater Natural Gas | 460736
Product Overview
Pentair MasterTemp 400 (460736) – Premium 400,000 BTU Natural Gas Pool & Spa Heater
The MasterTemp 400 is Pentair’s flagship high-output pool and spa heater, delivering exceptional heating speed and efficiency for large residential and commercial-grade pools. Built with robust materials and advanced digital controls, it combines powerful performance with a compact footprint, giving you dependable heat when you need it most.
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Heating Capacity: 400,000 BTU Input
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Fuel Type: Natural Gas
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Electrical: 120/240 V Single Phase, 60 Hz
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Weight: ≈ 140 lbs
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Warranty: 2 Years (when professionally installed)
Call-out Badges: Low NOx Certified • Eco-Select Choice • High Output • Commercial-Grade Performance
Ideal For
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Large in-ground residential pools or combination pool + spa systems
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Property owners wanting rapid heat-up and consistent water temperature
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Replacing older 350–400 K BTU gas heaters with an efficient, compact alternative
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Users who need dependable operation through extended swim seasons
Key Features
400,000 BTU Heating Power — The most powerful model in the MasterTemp line, providing quick, even heating for high-volume pools and spas.
Why it matters: Perfect for large installations where performance and speed are critical.
High-Efficiency Combustion System — Optimized burner and heat-exchanger design deliver more heat to the water and less wasted energy.
Why it matters: Saves fuel and lowers operating costs.
Durable Composite Cabinet — Rust-proof, weather-resistant exterior protects against corrosion and UV damage.
Why it matters: Reliable performance in any climate.
Rotating Digital Display & Self-Diagnostics — Simplifies setup and maintenance with clear digital readouts and easy-access controls.
Why it matters: Reduces downtime and improves user control.
Low NOx Emission Design — Certified to meet strict environmental standards.
Why it matters: Cleaner operation with reduced emissions and improved efficiency.
Benefits
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Fast Heating: Brings large pools or spas to temperature quickly
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Energy Efficient: Reduces fuel consumption without sacrificing power
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Quiet Operation: Low-noise design keeps backyard environments peaceful
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Rugged Longevity: Built to handle high demand and harsh outdoor conditions
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Compact Design: Fits standard equipment pads for easy replacement installs
Specs & What’s in the Box
Specifications
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Dimensions: 23″ W × 32.6″ D × 28″ H
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Weight: ≈ 140 lbs
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Materials: Composite cabinet with copper or cupro-nickel heat exchanger option
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Gas Connection: ¾″ NPT
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Electrical: 120/240 V single phase connection
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Fuel Type: Natural Gas
In the Box
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Pentair MasterTemp 400 Natural Gas Heater (460736)
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User manual and installation guide
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Mounting hardware and fittings
Compatibility & Replacements
Works with: Large residential and light-commercial in-ground pool and spa systems using natural gas supply
Replaces: Older Pentair MiniMax and other 350–400 K BTU heaters
Not compatible with: Propane systems (use model 460737) or ASME-certified installations (model 461058)
Trust Builders
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⭐⭐⭐⭐⭐ Pentair’s top-rated high-capacity heater for residential use
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Backed by a two-year limited warranty
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Supported nationwide through Pentair’s authorized dealer and service network
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Designed and assembled in the USA
Install Steps (Compact)
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Turn off power and gas supply
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Remove existing heater and prepare plumbing connections
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Mount MasterTemp 400 level on pad and connect water and gas lines
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Connect 120/240 V power and configure digital controls
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Test operation, verify ignition, and check for leaks and proper heating performance