Jandy JXiQ400NK 400K BTU Natural Gas Heater | Smart Pool and Spa Heater
Jandy JXiQ400NK 400K BTU Natural Gas Heater | Smart Pool and Spa Heater
Upgrade your pool heating capabilities with the Jandy JXiQ400NK 400K BTU Natural Gas Heater. Are you looking for a Smart, rodent proff, energy efficient propane heater? If so the JXiQ400NK has these capabilities and more.
What Does the Jandy JXiQ400NK 400K BTU Natural Gas Heater Do?
This Jandy JXiQ400NK has innovative VersaFlo Integrated Bypass technology. Which helps the heater provide energy up to 84% efficiency. This heater also provides owners with a heat-up time estimate status on the largest display in the industry. Also, can use this feature with the iAquaLink app, which needs Jandy AquaLink automation.
Furthermore, it has a compact cabinet construction and is designed to keep rodents out. It also helps installers and homeowners because the heater senses its supplied voltage with the Auto-sensing power input. Another, great feature is its one-of-a-kind low gas pressure switch that blocks ignition if there is a problem with the gas line.
Additionally, this heater is even equiped with extra sensors that give it self-diagnostics. This helps homeowners and service technicians find problems quickly by connecting to the aqua link app via blue tooth. There is even a sacrificial anode that pulls out corrosive elements in the water protecting heater parts.
*If ordering the 200K model it requires vents at 6 inches. The 400k model needs 8 inches, so check the vent run first.*

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Key Features
- Bluetooth connects pros to the Fluidra Pro App for real-time diagnostics on service calls
- Works with the iAquaLink app when paired with Jandy AquaLink automation
- Copper heat exchanger paired with Hi-Temp Poly headers
- Rated by Jandy for pools up to 600 square feet of surface area
- Compact, durable jacket construction protects against rodent damage
- Optional accessories include a 4-inch vent adaptor, air intake kit and control panel lock box
Technical Specifications
- Model: JXIQ400NK
- Fuel type: Natural Gas
- Input rate: 399K BTUH
- Efficiency: 84%
- Heat exchanger: Copper
- Headers: Hi-Temp Poly
- VersaFlo bypass: Included
- Minimum flow: 30 GPM
- Maximum flow: 100 GPM
- Pool surface area: up to 600 sq ft
- Vent diameter: 8 in
- Height: 26.5 in
- Width: 22.9 in
- Depth: 22.1 in
- Weight: 126 lbs
- ENERGY STAR: No
- Automation: Compatible
- Professional installation required: Yes
- Heat exchanger warranty: 5-year limited
Specs
- Part Number: JXIQ400NK
- Manufacturer: Jandy
Gas pool and spa heater
Heats only when the pool calls for it
VersaFlo Integrated Bypass sends water through the heat exchanger only when the heater needs to make heat. The display estimates how long the water needs to reach your setpoint, and it's 50% larger than before with room for 80 characters.
A sensor also reads the temperature rise between inlet and outlet, which helps keep flow where the heat exchanger wants it.
Gas pool and spa heater
Protection for the heat exchanger
A sacrificial anode pulls corrosive elements in the water away from the parts that matter. A low gas pressure sensor stops ignition when supply is short, and the power input adjusts to whatever voltage it's wired to.
Jandy backs the heat exchanger with a 5-year limited warranty on this VersaFlo model.
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What our customers are saying
Our pool service man gave us the information to order the part that had stopped working. It was easy to order and came so fast. Thank you.
Our pool service man gave us the information to order the part that had stopped working. It was easy to order and came so fast. Thank you.
Joann de Y
Fast pickup. The guy who helped me had a great attitude!
Fast pickup. The guy who helped me had a great attitude!
John R
Chuck and Bryan are both very helpful and kind / professional. Definitely recommend to others!
Chuck and Bryan are both very helpful and kind / professional. Definitely recommend to others!
Chad W
FAQ
Our expert staff answers customer's most asked questions.
What size pool does the Jandy JXiQ400NK heater work for?
Jandy lists the 400 size for pools up to 600 square feet of surface area. It has a 399K BTUH input rate and 84% efficiency.
What vent size does the Jandy JXiQ400NK need?
Jandy lists an 8-inch vent diameter for the 400 size. The 200 size uses 6 inches. Check the installation manual for vent run lengths and elbow limits before you plan the install.
Does the Jandy JXiQ400NK run on 120V or 240V power?
Either one. The heater senses the supplied power and adjusts on its own, so there are no cards to flip and no wires to change.
Can I install the Jandy JXiQ400NK heater myself?
Jandy requires a qualified pool and spa technician to install and service its gas heaters. Improper installation may void the warranty, so it's worth reading the owner's manual with your installer.
Can I control the Jandy JXiQ400NK from my phone?
Yes, if the pool has Jandy AquaLink automation. The iAquaLink app then handles control from anywhere. Pros can also connect over Bluetooth with the Fluidra Pro App for live diagnostics.
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