Pentair Mastertemp 300K BTU Heater Natural Gas | 460734
Product Overview
Pentair MasterTemp 300 (460734) – High-Efficiency 300,000 BTU Natural Gas Pool & Spa Heater
Delivering professional-grade heating power in a compact body, the MasterTemp 300 combines reliability, energy efficiency, and smart controls. It’s the go-to solution for larger residential pools or spas that need rapid heat-up and consistent performance without the bulk or noise of older units.
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Heating Capacity: 300,000 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: ≈136 lbs
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Warranty: 2 Years (when professionally installed)
Call-out Badges: Low NOx Certified • Eco-Select Choice • Compact Design • High-Output Performance
Ideal For
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Larger in-ground pools and spas needing quick, consistent heating
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Homeowners upgrading from legacy 250–300 K BTU gas heaters
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Tight pad installations requiring a small-footprint, lightweight unit
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Users focused on dependable, low-emission, high-efficiency performance
Key Features
300,000 BTU High-Capacity Heating — Delivers robust thermal output to quickly bring large pools and spas to temperature.
Why it matters: Ideal for extended swim seasons or cooler climates.
Compact Composite Cabinet — Corrosion-proof housing withstands outdoor conditions year-round.
Why it matters: Longer lifespan, even in coastal or high-humidity areas.
Rotating Digital Display & Diagnostics — Simplifies setup, monitoring, and maintenance with intuitive readouts.
Why it matters: Makes troubleshooting and control effortless.
Low NOx Burner System — Delivers cleaner combustion that meets or exceeds emission standards.
Why it matters: Environmentally responsible heating without sacrificing performance.
Benefits
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Powerful and Fast: Quickly recovers water temperature after use for uninterrupted comfort
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Energy-Efficient: High thermal efficiency saves on fuel costs over the season
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Quiet Operation: Engineered combustion system keeps noise to a minimum
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Durable Design: Composite shell resists rust, UV, and weather exposure
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Compact Footprint: Fits standard equipment pads and retrofit installations
Specs & What’s in the Box
Specifications
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Dimensions: 23″ W × 32.6″ D × 28″ H
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Weight: ≈136 lbs
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Materials: Rugged composite cabinet with copper or cupro-nickel heat exchanger
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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 300 Natural Gas Heater (460734)
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User manual and installation guide
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Mounting hardware and fittings
Compatibility & Replacements
Works with: Standard residential in-ground pool and spa systems using natural-gas supply
Replaces: Older Pentair MiniMax and similar 250–300 K BTU heaters
Not compatible with: Propane models (use 460735) or ASME-certified installations (model 461040)
Trust Builders
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⭐⭐⭐⭐⭐ Pentair’s most popular high-capacity residential pool heater
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Backed by a two-year limited warranty
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Supported through Pentair’s authorized 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 300 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 and check for leaks and proper heating performance