• Front view of Lochinvar ERN-402-A natural gas heater
  • Digital control panel on ERN-402-A heater
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Lochinvar 100143240 EnergyRite® Natural Gas Pool and Spa Heater 399K BTU

Lochinvar 100143240 EnergyRite® Natural Gas Pool and Spa Heater 399K BTU

$4,368.33
$5,460.41 $4,368.33
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Pool Heaters & Chillers

Efficient 399K BTU natural gas pool heater with digital controls and a rugged copper and cast iron build for dependable indoor or outdoor use.
Product Details

The Lochinvar ERN-402-A EnergyRite® heater delivers 399,999 BTU of natural gas heating power for fast, consistent water temperature control in pools and spas.

Its copper tubing and cast iron header offer a reliable and long-lasting heating solution built to withstand demanding environments.

The digital control interface allows for precise temperature management, helping you maintain ideal comfort with minimal effort.

Supporting both 120V and 240V, this heater adapts easily to a wide range of installation setups in residential and commercial properties.

With ASME-grade reliability and indoor/outdoor compatibility, the ERN-402-A combines performance, safety, and convenience in one rugged design.

AI Review Summary ✨

⭐⭐⭐⭐⭐
Customers love how fast this heater gets large pools and spas to temperature even in cooler weather.

The durable copper tubing and cast iron construction are frequently praised for holding up well over years of use.

Many users say the digital controls are intuitive and reduce guesswork when managing pool temperatures.

Reviewers find the heater highly energy-efficient, helping lower long-term operating costs.

Its ability to be installed indoors or outdoors makes it a favorite for versatile and space-saving setups.
Features
  • High BTU Capacity: 399,999 BTU of rapid and reliable heating power.
  • Natural Gas Powered: Efficient fuel source ideal for frequent use.
  • Digital Controls: Intuitive panel for easy, accurate temperature regulation.
  • ASME-Grade Performance: Commercial-quality components for durability and compliance.
  • Copper Heat Exchanger Tubing: Superior thermal transfer with corrosion resistance.
  • Cast Iron Header: Built tough for long-term strength under pressure.
  • Indoor/Outdoor Installation: Flexible configuration for diverse environments.
  • Dual Voltage Ready: Compatible with 120V and 240V electrical systems.
  • Energy Efficient: Engineered to minimize heat loss and save on fuel.
Specifications
  • Brand: Lochinvar
  • Application: Indoor, Outdoor, Pool, Spa
  • BTU Input: 399,999 British thermal units
  • Cabinet Depth: 22 inches
  • Cabinet Height: 26.5 inches
  • Cabinet Width: 41 inches
  • Commercial, Residential, or Professional: Commercial, Residential
  • Control Type: Digital
  • Each Product Weight: 240 pounds
  • Flow Rate Max: 100 gallons per minute
  • Flow Rate Min: 40 gallons per minute
  • Flue Diameter: 7 inches
  • Frequency Rating (Hz): 60
  • Fuel Type: Natural Gas
  • Gas Connection: 0.75 inch NPT
  • Green or Energy Efficient Product: True
  • Header Material: Cast Iron
  • Master Carton Quantity: 1
  • Minimum Sell Quantity: 1
  • Pallet Quantity: 1
  • Tubing Material: Copper
  • Voltage: 120V, 240V
User Guides
Frequently Asked Questions

Q: Can the ERN-402-A heater be used in both residential and commercial settings?
Yes, it is designed for flexible performance in both home and commercial pool or spa environments.

Q: What kind of maintenance is required for this heater?
Routine cleaning of filters, checking for debris in the flue, and inspecting the burner system ensure long-term efficiency and performance.

Q: Does this model come with ASME certification?
Yes, it’s built to ASME standards, which ensures high quality and safety compliance, especially for commercial use.
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Disclaimer:
Pool heaters and heat pumps are not returnable once installed or connected. Double-check fuel type, voltage, and sizing before installation.

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