MasterTemp Low NOx Natural Gas Water Heater

Product Names: Pentair MasterTemp Low NOx Natural Gas Pool Heaters — 125,000 BTU, 200,000 BTU, 250,000 BTU, 400,000 BTU

Product Codes: EC462024 (125K BTU), 460730 (200K BTU), EC462026 (250K BTU), EC462028 (400K BTU)

Maximum Altitude: 10,000 ft

BTU Options: 125,000 — 200,000 — 250,000 — 400,000 BTU

Heater Type: Natural Gas

Connections: 125K — 1.5 in. PVC; 200K / 250K / 400K — 2 in. PVC unions

Voltage: 125K — 120V plug (5 ft cord) or 120/240V hardwire; Other BTUs — hardwired 120V or 240V

Dimensions: 125K — 36×22×24 in.; 200K — 23×36×30 in.; 250K — 22×36×30 in.; 400K — 27×36×35 in.

Warranty: 125K — 1 Year; 200K — 60 Days; 250K — 1 Year; 400K — 1 Year (all require licensed technician installation)

High‑efficiency heaters engineered for fast heat‑up, quiet operation, and compact installation. Models feature pre‑mixed combustion for superior thermal efficiency (82%–84%), low‑NOx emission performance exceeding industry standards, and rugged, rust‑proof housings that resist heat and weather. All units include an easy‑to‑use rotating digital display and optional 120V/240V electrical configurations depending on model. The 125K BTU model is ideal for pools/spas up to 15,000 gallons; higher‑BTU models offer increased heating speed and capacity for full‑size inground pools. To convert the 125K to propane, use part 461063.

Features:

• Fast heat‑up time
• Best‑in‑class energy efficiency (82%–84%)
• Pre‑mixed combustion for rapid ignition
• Certified low‑NOx eco‑friendly emissions
• Rotating digital display
• Rugged, rust‑proof exterior panels
• 120V plug‑in ready (125K) or 120V/240V hardwire options
• 2 in. PVC union connectors (200K+)
• Manual gas shut‑off (200K+)
• High‑capacity cupronickel heat exchanger on selected models

Warnings:

• External power supply required — electrical specs: 120VAC, 60Hz, 1 phase, 5.5A (125K BTU)
• Requires 15A circuit protection (125K BTU)
• Not compatible with soft‑sided pools (Intex, Bestway, Coleman) — insufficient flow and warranty void

Warranty Coverage: Limited manufacturer’s warranty applies only when installed by a licensed technician. Coverage includes replacement parts (no labour). Warranty void if damaged due to improper installation, improper water chemistry, freeze damage, or use on soft‑sided pools.