Lochinvar 100284845 Aquas Natural Gas Energy Efficient Indoor Heater 400K BTU
Lochinvar 100284845 Aquas Natural Gas Energy Efficient Indoor Heater 400K BTU
Pre-assembled, energy-efficient 400,000 BTU indoor natural gas heater with titanium heat exchanger for commercial pool applications.
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The Lochinvar Aquas APN400 is an advanced commercial pool heating package that combines a high-efficiency boiler with a dedicated titanium heat exchanger.
This 400,000 BTU indoor system is pre-assembled at the factory for faster installation and seamless integration into commercial aquatic environments.
Operating on natural gas, the Aquas heater is designed to deliver consistent, energy-saving performance with a thermal efficiency of 98%.
Its digital control system ensures accurate temperature regulation and simplified system monitoring for pool operators.
Engineered for durability and corrosion resistance, the titanium heat exchanger is ideal for aggressive pool water chemistry.
This compact, reliable unit brings together performance, safety, and convenience for indoor commercial pool heating.

⭐⭐⭐⭐⭐
Buyers praise the APN400’s energy efficiency and fast heat-up times for busy commercial pools.
Facility managers appreciate the pre-piped, factory-assembled design for reducing installation time and complexity.
Operators find the digital controls intuitive, offering precise temperature management with minimal effort.
Many note the titanium heat exchanger’s reliability, even in harsh water conditions, as a standout feature.

- BTU Output: 400,000 BTU of powerful and efficient pool heating
- Fuel Type: Natural gas for clean, consistent operation
- Thermal Efficiency: 98% energy efficiency for lower operating costs
- Heat Exchanger: Titanium construction for superior corrosion resistance
- System Type: Factory-assembled boiler-to-exchanger package
- Control Type: Digital controls for temperature precision and monitoring
- Application: Ideal for commercial indoor pools
- Installation: Freestanding, pre-piped system for quick setup

- Brand: Lochinvar
- BTU Output: 400,000
- Application: Indoor, Pool
- Fuel Type: Natural Gas
- Flow Rate Max: 52 GPM
- Thermal Efficiency: 98%
- Control Type: Digital
- Each Product Weight: 622 lb
- Shipping Dimensions: 49 x 43.25 x 55.5 in
- Commercial/Residential Use: Commercial
- Master Carton Quantity: 1
- Minimum Sell Quantity: 1
- Pallet Quantity: 1


Q: What makes the Lochinvar Aquas package different from standard pool heaters?
It features a factory-assembled system that combines a high-efficiency boiler with a dedicated titanium heat exchanger, simplifying installation and improving durability.
Q: Can this unit handle corrosive pool water?
Yes, the titanium heat exchanger is highly resistant to corrosion, making it ideal for pools with aggressive or chemically treated water.
Q: Is this heater suitable for outdoor use?
No, the APN400 is specifically designed for indoor commercial pool environments with a freestanding, enclosed configuration.


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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