<p>The MasterTemp 125 Heater provides energy-saving and advanced operating features that are available only from much larger heaters. With its revolutionary pre-mixed gas combustion technology, the MasterTemp 125 Heater offers 82% thermal efficiency, the highest in its class. The advanced LCD/controller provides more information and better control.</p> <ul> <li>High-performance, affordable heater with premium features</li> <li>82% energy efficiency is the highest in class</li> <li>1-1/2 in. Plumbing connection — ideal for smaller bodies of water, including aboveground pools, spas, and inground pools up to 15,000 gallons</li> <li>Pre-mixed combustion technology for ultra-fast heat up</li> <li>Easy-to-use digital display/controller</li> <li>Certified for low NOx emissions</li> <li>Lightweight: 80 lbs. — easy to handle and ship</li> <li>Corrosion and UV-resistant enclosure</li> <li>3/4 in. gas line up to 50 ft. from the source</li> <li>Certified for outdoor and indoor installations</li> <li>461061 Replaced by EC-462025</li> <li data-mce-fragment="1">For <a href="https://www.vitafilters.com/products/pentair-474845-direct-air-intake-duct-kit-for-mastertemp-125-heater" title="Air Intake Kit order part number 474845" rel="noopener" target="_blank">Air Intake Kit order part number 474845</a> </li> </ul> <div class="sc-bczRLJ kEeNDb" data-test-selector="productDetails_htmlContent"><strong>Documents:</strong></div> <div class="GridItemStyle--1uambol bTvvjG"> <div class="sc-bczRLJ kEeNDb"> <ul class="TypographyStyle--11lquxl ghReyy"> <li class="TypographyStyle--11lquxl gtqutn"><a title="Pentair EC 462025 MasterTemp 125 Propane Gas Pool Heater 125K BTU" href="https://poolimages.blob.core.windows.net/insite/Product/Documents/PU/R-/15/PUR-15-2008-bro.pdf" target="_blank"><span class="TypographyStyle--11lquxl jJOnEq StyledTypography--14dgqsg kYJRjU"><span class="TypographyStyle--11lquxl dVwepL"><span class="TypographyStyle--11lquxl eoJorN">Brochure</span></span></span></a></li> <li class="TypographyStyle--11lquxl gtqutn"><a title="Pentair EC 462025 MasterTemp 125 Propane Gas Pool Heater 125K BTU" href="https://poolimages.blob.core.windows.net/insite/Product/Documents/PU/R-/15/PUR-15-2008-ig.pdf" target="_blank"><span class="TypographyStyle--11lquxl jJOnEq StyledTypography--14dgqsg kYJRjU"><span class="TypographyStyle--11lquxl dVwepL"><span class="TypographyStyle--11lquxl eoJorN">Install Guide</span></span></span></a></li> <li class="TypographyStyle--11lquxl gtqutn"><a href="https://www.vitafilters.com/pages/pool-heaters-btu-quick-reference-charts" title="How to Size a Pool Heater: BTU Quick Reference Chart" style="font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;" target="_blank">How to Size a Pool Heater: BTU Quick Reference Chart</a></li> </ul> <p><strong><span class="TypographyStyle--11lquxl jJOnEq StyledTypography--14dgqsg kYJRjU"><span class="TypographyStyle--11lquxl dVwepL"><span class="TypographyStyle--11lquxl eoJorN">Specifications:</span></span></span></strong></p> <ul> <li>Brand: Pentair</li> <li>Application: Indoor, Outdoor, Pool, Spa</li> <li>Commercial, Residential, or Professional: Residential</li> <li>Weight: 110 pounds</li> <li>Flow Rate Max: 70 gal/min</li> <li>Flow Rate Min: 20 gal/min</li> <li>Fuel Type: Propane</li> <li>Depth: 23 inch</li> <li>Height: 21 inch</li> <li>Width: 21 inch</li> <li>BTU Input: 125,000 British thermal unit</li> <li>Thermal Efficiency: 82</li> </ul> </div> </div>