Sta-Rite Max-E-Therm 400 HD High Performance Heater, Natural Gas, 400K BTU, 120/240 VAC, 60 Hz, 127 lbs | SR400HD

This is a powerful and efficient heater designed for quickly heating large pools and spas, known for its robust construction and reliable performance. Here's a breakdown:

• Sta-Rite Max-E-Therm Series: This indicates a line of high-quality pool and spa heaters from Sta-Rite, a well-regarded brand.
• 400 HD (Heavy Duty): The "HD" designation indicates a heavy-duty, robust design, built for demanding applications and long-term durability.
• 400K BTU (400,000 British Thermal Units): This is a very high heating capacity, making it suitable for rapidly heating large pools, spas, or pools in colder climates.
• Natural Gas: This heater utilizes natural gas as its fuel source, a common and efficient option.   
• 120/240 VAC, 60 Hz: This indicates the heater's electrical requirements, meaning it can operate on either 120-volt or 240-volt AC power at 60 Hertz, providing installation flexibility.
• 127 lbs (Weight): This gives you an idea of the heater's size and build quality. It is a substantial unit. Note that there are resources that state the weight to be closer to 138-140 pounds.
• High Performance: This indicates the heater's ability to quickly and efficiently raise the temperature of pool or spa water.
• Applications:
  • Large residential pools.
  • Commercial pools and spas.
  • Pools and spas in colder climates.

Key features:

• Rapid heating capabilities.
• Durable, heavy-duty construction.
• Efficient natural gas operation.
• Flexible voltage compatibility.

In essence, the Sta-Rite Max-E-Therm 400 HD is a high-performance, robust heater designed for those needing to heat large volumes of water quickly and reliably.