Jandy JXiQ 400 with VersaFlo

Last updated: November 9, 2026

Jandy JXiQ 400 with VersaFlo
3.6/5#6 of 16 in 250,000 BTU and up gas pool heaters
3.6

For a large in-ground pool with a variable speed pump, where the built in bypass and smart diagnostics earn back the price.

  • 399,000 BTU/hHeating input
  • 84%Efficiency
  • Natural gas or propaneGas type
Check price at Amazon$4,991.71

Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros
  • VersaFlo bypass skips the heat exchanger when not heating, cutting pump energy with a variable speed pump
  • Five year heat exchanger warranty with factory VersaFlo
  • Checks gas pressure before ignition and measures temperature rise to protect the heat exchanger
  • Low NOx with 84% efficiency
Cons
  • Bluetooth diagnostics run through a pro app, not a homeowner app
  • Costs more than Hayward and Raypak heaters of similar input
  • Needs a large gas line

How it scores

The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.

Specifications

Model numberJXIQ400NK
Heating
Gas input399,000 BTU/h
Gas typeNatural gas or propane
Thermal efficiency84%
CondensingNo
Low NOxYes
Heat exchangerCopper
Max water flow100 GPM
Installation and controls
IgnitionElectronic
VentingBoth
Digital controlsYes
Automation or appYes

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