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Gas Pool Heaters

Jandy Laars

Model: LX-LT

GAS Pool Heaters - Discover quality alternative heating options
to be sure that Gas Heating is the right choice for your pool.

Were you aware propane or natural gas has the highest operating
cost, and is the least efficient / cost effective way to heat a pool?

If you require rapid heat up, constant temperature regardless of
outside temperature, or you are heating a spa or hot tub, then the
gas heater below may be right for you.

ALERT » View other higher efficiency options
. Side-by-side major heating systems comparison guide reviews
. the details on Gas Heaters, and how they compare to the two
. other major heating methods - Heat Pumps and Solar

HELP » Contact Customer Support
. Toll-Free help line offering system selection support 


Advanced digital controls and simple operation make this the heater of the future, providing more precision and less hassle.

The Laars LX and LT earn a solid 5 star rating in the Energy SuperMarket's Consumer Value guide.

Jandy gas heaters will effortlessly raise your pool's temperature well into the 80-90 degree range, and/or your spa to 104 degrees, generate a rapid heat-up, plus ensure a constant temperature regardless of weather conditions.

In addition to warming the water, the swimming season can be extended in cooler climates by as much as 50 percent. Jandy units require little to no maintenance, and typically last 5 to 10 years, or more.

With over one million units installed, Jandy's Laars heaters continue to provide reliable and efficient comfort for your pool and spa. So advanced.... It's simple!

Jandy's Laars LX and LT Highlights:

. Automatic pool-to-spa switching with the addition of the EZ wireless remote control automation kit

. Corrosion-resistant polymer construction produces greater flow capacity, longer heater life and improved pool circulation.

. Fan-assisted, controlled combustion provides consistent 83% efficiency in any weather condition.

. Low-profile design and small footprint make this heater ideal for locations with limited space.

. Low Emissions - meets all clean air standards
The LX and LT Low NOx gas heaters comply with the most stringent state and county emissions laws. NOx emissions are less than 40 nanograms per joule.


LX Features:

Advanced digital controls and simple operation make this the heater of the future. Plus, it's the first Laars Heater that can talk directly to a Jandy AquaLink RS controller!

. User-friendly Graphical User Interface (GUI) lets you make precise
adjustments and perform complete diagnostics with the touch of a
. button. The LX control and user-friendly graphical interface are key
element in your AquaLink® RS controlled pool/spa environment.


LT Features: 

. The Laars LT offers all the features of the LX, including automation
. readiness, but with a simplified dual electronic thermostat

Laars LX and LT Specifications:

The Laars LX and LT have no standing pilot burner.  They exceed the requirements of energy conservation regulations such as those in California, Hawaii, New York, Oregon and other states which require that a pool heater not have a continuous ignition source.

Model LT 250: 250,000 BTUs - dual electronic thermostat
Model LT 400: 400,000 BTUs - dual electronic thermostat
Model LX 250: 250,000 BTUs - advanced digital controls
Model LX 400: 400,000 BTUs - advanced digital controls

How to choose the right size pool heater:
First, determine the desired temperature difference by subtracting the coldest average air temperature when the pool will be in use from the desired pool water temperature.

Example: 85ºF [desired pool water temperature] - 60ºF [air temperature when pool is opened] = 25ºF difference. 

Then, using the Pool Heater Sizing Chart below, select the appropriate heater model number. [Sizing chart based on 3-1/2 mph average wind and average pool depth of 5-1/2 feet]

Temp. diff
Model 250
Model 400
Blue figures are based on zero wind

How to choose the right size spa heater:
Identify the number of gallons your spa holds. Decide the heat-up time desired, and note on the chart which Laars LT/LX model is recommended. The chart indicates the approximate time required to rise the spa temperature 30ºF.

Example: A model number 250 heater on a 600 gallons spa will take approximately 45 minutes to raise the temperature approximately 30ºF [depending on wind, insulation, etc]

Spa Size [gal]
Time to Heat Spa 30ºF (minutes)



Gas Heater Installation - Upon delivery of unit,
installation of a heater can be performed by homeowner, but The Energy SuperMarket strongly recommends the installation of any new or replacement gas heater be done by trained personnel, a licensed and insured contractor, or by a pool/spa professional.

Gas Connections - Actual hook-up of the gas connections and the turn-on of the gas itself are highly recommend, and in most states legally required, to be performed by a licensed and insured plumber, or a gas utility company employee.

. Critical WarningDo not attempt to connect gas lines or turn-on gas yourself! Serious personal injury, damage to the unit and/or home, fire, or explosion could result !!!


Function: Warms pool/spa to 80-90° plus extends season
Benefits: Maximizes your pool/spa investment!

Product Applications:
. Residential and commercial installations.
. Do-it-yourself project; average three hour installation
. Change-out feasible by handy-person / hand tools
. Gas hook-up performed by a licensed professional
Easy to read step-by-step installation manual
. Excellent for pools/spas at residential, condo, resort,
. hotel, motel, and vacation home locations
. Supplementing a gas heater with a solar pool cover
. greatly enhances its performance, plus reduces
. energy costs up to 70 percent - thereby saving
. hundreds of dollars per year in pool heating costs!

Product Features:
. Contemporary design blends into landscape
. Low NOx - meets all clean air standards.
. Swimming season extended up to 50% in cool climates
. Heats spa to toasty 104 degrees - maximum legal limit

. Warranty - 5 Year Limited Warranty

. Proper unit selection supported by customer service agent
. Installation supported by engineering tech assistance
. Toll-Free help line and/or online e-mail tech support
. Worldwide shipping available - delivered to your doorstep
. Lowest factory direct pricing available anywhere! 
. Guaranteed.

Product Manufacturer: Jandy

NOTICE:  Southern CA and TX law requires Low Nox units. 
Units delivered and installed in these areas must select Low Nox. 

PDF Download

Operation and Installation Manual

Gas Heaters for
Inground Pools

RayPak R Series
RayPak LowNOx
Pentair Minimax
Hayward H-Series
Jandy Laars Lite2
Jandy Laars Hi-E2
Jandy Laars LX/LT

Gas Heaters for AboveGrnd Pools

Pentair Minimax
Hayward H-Series

Other Products

Solar Pool Heaters
Heat Pump Heater

Compare Options

Compare solar pool heaters, heat pumps and gas heaters in this side-by-side comparison chart.
Comparison Chart

Learn How To:

Extend your swimming season

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