Pentair Water Pool and Spa

Pentair Mastertemp Heater Water System Max-E-Therm Heater Water System Coil/Tubesheet Sealing Oring Kit Models 300Na, 300Lp (10) | 77707-0118

SKU: 77707-0118
SKU: 77707-0118
MSRP: $62.99
(10%​ off)
(You save $6.03 )
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1 year warranty from the manufacturer
1 year warranty from the manufacturer
Availability: In Stock
Shipping Cost: Calculated at Checkout
Weight: 1.00 LBS
GTIN: 22315209756
MPN: 77707-0118
SKU: 77707-0118
Warranty: 1 year warranty from the manufacturer

Pentair | MasterTemp® Heater Water System | MAX-E-THERM® HEATER WATER SYSTEM | Coil/Tubesheet Sealing Oring Kit Models 300NA, 300LP (10) | 77707-0118


Part for Heater Models : MasterTemp® Heater Water System : MAX-E-THERM® HEATER WATER SYSTEM




High Performance Eco-Friendly Heaters

MasterTemp® offers all the efficiency, convenience and reliability features you want in a pool heater, plus a lot more. As easy to use as your home heating system, plus, user-friendly indicator lights make system operation and monitoring a snap. The compact design and super quiet operation won't intrude on your poolside leisure time. Heavy-duty (HD) unit with cupro-nickel exchanger stands up to the harshest of applications, like low pH, high flow or heavy use.


  • Heats up fast so no long waits before enjoying your pool or spa
  • Best-in-class energy efficiency*
  • Manual gas shut-off when service is required
  • Eco-friendly MasterTemp® is certified for low NOx emission and outperforms industry standards
  • Rotating digital display allows for easy viewing
  • Tough, rustproof exterior handles the heat and weathers the elements



MasterTemp High Performance Heater

Green Brochure: Environmentally Responsible Products from Pentair



MasterTemp Installation & User's Guide

MasterTemp & Max-E-Therm Bypass Access Plug Kit Instructions (ASME Models Only)

MasterTemp (Australia) Pool & Spa Heater Operation & Installation Manual

Heater New Installation Checklist