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There are numerous brands that are in the market for providing hot water for swimming pool. Pool water heaters also come in various shapes and types. Hence comparison amongst all of them would be close to impossible. But, below is a list of a few of the products that are well known in the market and a description about them. This would help you comapre amongst them and decide which one would be applicable to your case.

1. Hayward H400FDN 400,000 BTU Pool Heater

This 400K BTU natural gas heater from Hayward is a shining example of why the company has become a leader in the pool heating industry. Thanks to its energy-saving hydraulic performance, the Hayward 400,000 BTU H400FDN is capable of heating an 800-gallon pool by as much as 30 degrees in under an hour and keeping it comfortably warm with reduced pump circulation, allowing you to enjoy an extended swimming season without noticing a drastic increase in your energy bill.

Type: Natural Gas Pool Heater

• Energy Efficient
• Powerful and fast-acting
• Reasonably priced
• LED control panel and display
• Easy to install

• A little loud
• Not weatherproof

Product Details/Specifications:
• 400K BTU natural gas heater
• Dual Thermostat
• Electronic ignition
• LED digital display and control panel
• Cupro Nickel Heat Exchangers
• Polymer header for improved hydraulic performance
• Meets NOx emission standards
• One-year warranty

2. Sta-Rite SR400NA Max-E 400,000 BTU Pool Heater
Designed to last a lifetime and outperform every other pool heater on today’s market, the Sta-Rite SR400NA Max-E 400,000 BTU Pool Heater may come in a small package, but it definitely packs a powerful punch. With exact temperature controls, a rust-proof enclosure, and pre-mixed gas combustion technology, this impressive heater is durable, easy to operate, and works much better than many of the traditional pool heaters being made today.

Type: Natural Gas Pool Heater

• Durable
• Energy-efficient
• Lightweight
• Small and compact
• LED control panel and display
• Environmentally friendly
• Low operating costs

• A little noisy
• Some complaints about packaging

Product Details/Specifications:
• 400K BTU natural gas heater
• Rust-proof Dura-Glas technology
• High efficiency rating
• Easy-to-use LED control panel
• Self-diagnostics
• Meets NOx emission standards

3. Eco Saver 20-Foot Solar Heating Panel System
Specializing in green energy solutions, Eco Saver has developed arguably the best solar pool heater on the market. Capable of keeping your swimming pool comfortably warm all season long without impacting your electric bill, the Eco Saver 20-Foot Solar Heating Panel System is a budget-friendly pool heating solution for every modern pool owner.

Type: Solar Pool Heater

• Utilizes the sun’s energy for power
• Inexpensive and budget-friendly
• Modular design
• 20 percent wider than the majority of panels
• Ability to add more panels for any size pool
• Availability of accessories

• Time-consuming set-up process
• Lacks temperature controls

Product Details/Specifications:
• 20-foot solar panel capable of heating a 15-foot by 30-foot in-ground pool or a 24-foot above ground pool
• Modular design provides ability to add more solar panels for larger pools
• Flexible panel material with twist-connect fittings for easier installation
• Panels are 20 percent wider than traditional solar panels for maximum heating power
• Roof mount kit, Intex pool adapter kit, diverter valve kit, and other accessories available

4. Pentair 460737 400,000 BTU Pool Heater
The Pentair 460737 400,000 BTU Pool Heater provides the convenience, efficiency, and reliability you would expect from a top-quality pool heater, plus a whole lot more. Designed to be the best gas pool heater around and set the bar in pool heating efficiency, the Pentair 460737 features a compact design, corrosion-proof exterior, incredible energy efficiency, and the ability to quickly heat the largest of pools. So, if you’ve been scouring pool heaters reviews in search of the best gas pool heater for your pool, it’s hard to ignore this popular model.

Type: Natural Gas Pool Heater

• Best-in-class energy efficiency
• Certified to meet and exceed NOx emission standards
• Rotating digital display
• Rust-proof exterior
• User-friendly indicator lights
• Easy Touch automation compatibility

• Boxy, utilitarian exterior design

Product Details/Specifications:
• 400,000 BTU natural gas heater
• Best-in-class energy efficiency
• Rotating digital display for quick and easy viewing
• Push-button digital controls
• Electronic ignition
• Cupro nickel heat exchanger
• Water pressure switch and high limit switches to prevent overheating
• Fully pre-mixed air and gas system