How big a pool will the 400K BTU model heat?

It is sized for medium to large inground pools, roughly up to 20,000 to 25,000 gallons in mild climates. Larger pools or cold-weather use may need more output.

Does it work with propane?

Yes. The heater can be set up for natural gas or propane, but the gas orifice and regulator must match the fuel. Confirm the configuration before installing.

How is it different from a heat pump?

It heats much faster and works in cold air, but gas usually costs more per unit of heat. A heat pump is slower and needs mild air temperatures.

What maintenance does it need?

Expect annual service: cleaning the burner and heat exchanger, checking the igniter and watching for scale or soot. Keep the water chemistry in range to protect the exchanger.

What comes in the box?

The heater unit itself, with the digital display and controls. Gas piping, venting and electrical connections are supplied by the installer.

What do buyers say about the Pentair MasterTemp 400K BTU Pool Heater 460737?

Rated 4.4 out of 5 from 85 ratings. Buyers like: Price lower than Amazon; Delivery was excellent; Arrived in about a week.

Where can I buy the Pentair MasterTemp 400K BTU Pool Heater 460737?

11 stores we checked sell it, including Hydropool.com, AppaeTech Pool Supply, Pool Cleaning Parts, PoolSuppy4Less, Pool Plaza.

Pentair MasterTemp 400K BTU Pool Heater Price History: $3,499.99

Q: Where is the Pentair MasterTemp 400K BTU Pool Heater 460737 cheapest?

At Hydropool.com, for $3,499.99, 22% under what the other stores charge, as of our latest check.

What reviewers say

4.4 / 585 ratings

Buyers rate it well overall, with praise for fast heating and quiet operation. Complaints center on installation cost and the upkeep a gas heater requires.

What people mention

Heat-up speedPraisedOwners say the pool warms noticeably faster than with their previous heater.
NoisePraisedBuyers describe it as quiet for a gas heater of this output.
InstallationMixedReviewers say it works well once installed but needs a qualified tech and a proper gas supply.
Running costCriticisedSome owners note gas heating costs more to run than a heat pump.
MaintenanceCriticisedA few report repairs and part replacements after several seasons.

From Pool Cleaning Parts

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
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

Sizing: Measures about 32.5" X 23" X 28"
Guarantee: 60-day parts warranty for homeowners who purchase online; pool professionals' customers receive a 2-year warranty.
Shipping: Free shipping and no sales tax; ships freight truck (2-5 days).

About the Pentair MasterTemp 400K BTU Pool Heater 460737

The Pentair MasterTemp is a 400,000 BTU pool heater for heating a pool or spa. It heats up fast, so there is no long wait before use. It is designed to be as easy to use as a home heating system, and indicator lights make it simple to operate and monitor.

The heater has a compact design and runs very quietly. It has a rotating digital display that is easy to view. The exterior is rustproof and built to handle heat and outdoor weather.

The MasterTemp is certified for low NOx emissions and outperforms industry standards. It includes a manual gas shut-off for when service is required.