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Home Raypak Digital Natural Gas Pool Heater 399k BTU | Electronic Ignition | P-R406A-EN-C 009219 P-M406A-EN-C 009965
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Raypak Digital Natural Gas Pool Heater 399k BTU | Electronic Ignition | P-R406A-EN-C 009219 P-M406A-EN-C 009965

Raypak Digital Natural Gas Pool Heater 399k BTU | Electronic Ignition | P-R406A-EN-C 009219 P-M406A-EN-C 009965 Raypak Digital Natural Gas Pool Heater 399k BTU | Electronic Ignition | P-R406A-EN-C 009219 P-M406A-EN-C 009965 Raypak Digital Natural Gas Pool Heater 399k BTU | Electronic Ignition | P-R406A-EN-C 009219 P-M406A-EN-C 009965 Raypak Digital Natural Gas Pool Heater 399k BTU | Electronic Ignition | P-R406A-EN-C 009219 P-M406A-EN-C 009965 Raypak Digital Natural Gas Pool Heater 399k BTU | Electronic Ignition | P-R406A-EN-C 009219 P-M406A-EN-C 009965 Raypak Digital Natural Gas Pool Heater 399k BTU | Electronic Ignition | P-R406A-EN-C 009219 P-M406A-EN-C 009965 Raypak Digital Natural Gas Pool Heater 399k BTU | Electronic Ignition | P-R406A-EN-C 009219 P-M406A-EN-C 009965 Raypak Digital Natural Gas Pool Heater 399k BTU | Electronic Ignition | P-R406A-EN-C 009219 P-M406A-EN-C 009965 Raypak Digital Natural Gas Pool Heater 399k BTU | Electronic Ignition | P-R406A-EN-C 009219 P-M406A-EN-C 009965

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Platinum Preferred Manufacturer
  • Raypak Indoor Stack Top 406, 407, & 408 Models | 9" Vent | 009841
    Raypak 406/407/408
    Stack Top 9" Venting 009841

The sleek and stylish Raypak Digital Gas Pool and Spa Heater features innovative technology designed to keep your pool or spa at the perfect temperature for your enjoyment. Built to withstand various weather conditions, this modern pool and spa heater is the perfect solution for environments requiring efficiency, convenience and versatility.
Thanks to a brilliant low-profile design, corrosion resistant cabinet made of galvanized metal, copper fin tube heat exchanger, and a bevy of advanced-engineered materials, enjoying your heater year round is a breeze.
Electronic Ignition
Raypak Digital heaters come standard with intermittent spark ignition pilot safety controls. What this means is that the pilot only comes on when there is a call for heat. This is a more energy efficient way to control you heaters gas usage by not having a standing pilot. Raypak has been using the same reliable electronic pilot ignition design for over 20 years.
Microprocessor Controlled Thermostat
The Raypak Digital gas heater comes with a microprocessor based thermostat control. This control allows you to set your pool or spa temperature precisely at your favorite setting just by pressing an up or down temperature control button. The Digital display gives you a constant read out of your pool water temperature. Just set it, and forget it! Truly simple.
Self Diagnostic
Troubleshooting a gas heater has never been easier. The Raypak Digital has on-board diagnostic controls that let the user and the service professional know what is going on with the heater at all times. In the event that you would ever have a problem with the heater, the digital display will show where the problem is in the control circuit. It's like having a service technician built into every heater!
Remote Compatible
The Raypak Digital is compatible with most major pool control and remote systems on the market today. Any two-wire or three-wire remote can connect to the Raypak Digital and be integrated into the pool control system of your choice.
Built-in Wind Resistant Design
The Raypak Digital has the best outdoor design in the market today. With over 50 years in designing and building gas heaters, Raypak has put all that experience into its newest heater design. No need for fans to combat drafting problems, the Raypak Digital was designed for outdoor installations with its exclusive low profile design. It is so thoughtfully and carefully designed it actually protects itself from the things that tend to stifle ordinary pool and spa heaters: falling leaves, wind, airborne debris, rain, downdrafts, updrafts, sleet, snow, etc. In fact it is so efficiently designed it ensures uninterrupted heating performance regardless of all but the most extreme weather conditions. Built Raypak tough. Built to last.
Smart Design
One look will tell you that the Raypak Digital is different! The look is contemporary. The design is advanced. And inside and out it's engineered to last. The attractive forest green and charcoal gray panels complement the latest pool and spa equipment designs. Raypak's original "pagoda top" design will keep the heater operating even in extreme wind conditions and downdrafts
Polytuff Powder Coating
The Raypak Digital has a polyester coated, non-corrosive cabinet that is more durable than solventborne and waterborne coated metal cabinets. Every piece of sheet metal that gets powder coated goes through a 7-stage wash system making certain the powder paint has a perfect bond. Underneath the tough and beautiful finish you will find galvanized metal that offers superior rust prevention and years of durable service.
Polymer Header
The Raypak Digital incorporates the latest in header design technology. Raypak's state-of-the-art engineering department utilized the latest in 3-D computer aided design to engineer the part for optimal performance. Polymer resin headers prevent rust stains from harming your pools surface giving you years of trouble-free swimming pleasure
All Copper Fin Tube Heat Exchanger
All Raypak Digital gas heaters come standard with integral copper finned tube. This means that the fin tubing is made from one piece of extruded copper tube. Since the fins are integral to the tube, maximum heat transfer is attained. Every Raypak Digital has the same robust design tube bundle that we use in our large gas commercial boilers.
Stainless Steel Tube Sheet
Stainless steel tube sheets are used on all Raypak Digital heaters that use the Polymer resin headers. This allows for a completely nonferrous waterway leaving your pool truly rust-free.
CPVC 2" Water Connections
Standard with every Raypak Digital is a set of 2" slip fit CPVC water connections to make your installation secure and effortless.
Condensation Protection
Standard on all Raypak Digital models is Raypak's Unitherm Governor, which helps reduce condensation from low inlet water temperatures. The Unitherm Governor automatically regulates the water flow to help keep the water temperature in the heat exchanger above 105 Degree F. Both water temperature and water flow rate are controlled to eliminate condensation, sooting, and scale buildup that can shorten heater life.
High Flow Rates
No need to worry about large pumps or high flow systems. The Raypak Digital comes with an automatic bypass built into the header. You'll find that the Raypak Digital delivers the industry's lowest pressure drop and highest water flow rate - up to 125 gallons per minute - exceeding the maximum recommended for 2" plumbing systems. More hot water moves through faster and more efficiently.
Fuel Efficient
Efficient? You bet. Energy-smart Raypak heaters consistently achieve the highest efficiency ratings and the Raypak Digital is no exception. It exceeds all federal and state standards.
Burner Tray
Every Raypak Digital burner tray is built to last. From the stainless steel burners to the aluminized metal used in the heat sensitive areas. In the event that anything should happen to your burners they can be quickly and easily serviced. One more reason why the Raypak Digital is made to take the work load year after year.
Fire Tile
A ceramic fiber combustion box keeps your Raypak Digital running efficiently and keeps the outside jacket cool. By using this space-age material the heater won't retain residual heat after it is turned off, allowing it to be installed without the use of costly metal heat sinks.

Brand: Raypak
BTU Rating
Gas Type
Natural Gas
Q & A
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 33 questions Browse 33 questions and 35 answers
I have a 36,000 gal pool. What size/type heater should I buy?
A shopper on Apr 26, 2019
What is the size of the heater I need for 8000 gallons pool?
Zoran P on Aug 12, 2018
I'm putting a roof over my pool heater to protected it from the weather
and concerned about the venting, how much space is needed above the heater itself ?
A shopper on Nov 3, 2019
What is efficiency rating?
JACK e on Oct 7, 2019
BEST ANSWER: Manufacturers website should have that info, it’s very efficient though.
Is it compatible with salt water pools?
A shopper on Nov 3, 2018
BEST ANSWER: Yes have had no problems - great heater
Can the in and out water be on left side?
Robert Z on Mar 5, 2019
What size heater is needed for a 20,000 gallon pool?
A shopper on Apr 29, 2016
BEST ANSWER: There are a couple of factors that impact the size of the heater required to satisfactorily heat a pool. I strongly suggest you contact a pool dealer in your area for his recommendation for size. Then you can order a heater that is sized properly for your pool. Too small and the heater will never cycle and overwork your system and pocketbook. Too large and your pool return line will become too hot as the heated water returns to the pool.. Location is important too. Ground temperatures are different throughout the USA andif the heater you purchase is to small the unit will struggle to achieve the desired temperature. In my case here in Cape may NJ my pool is 25,000 gal in ground with an attached spa and the correct size of heater is 400,000 BTU's. The pumping system also impacts the heater circulation and is critical to satisfactory operation. So the bottom line is have a professional size the heater for you for maximum efficiency
What size heater do I need for a 25,000 gallon pool with a hot tub. What is better gas or electric?
Dani V on Nov 14, 2018
BEST ANSWER: I am not an expert. However, this is the heater that my pool contractor provided with our very large saltwater pool and hot tub install. We had to replace The original one like this because my husband was an idiot and placed a huge plastic bucket full of chlorine on top of the original unit. Thus, the bucket melted causing a huge fire in our pump house.

I would not advise doing that.

The replacement heater has worked great. I suggest you learn how to use it properly though. Clicking buttons through trial and error is not advisable. If you accidently put it in manual mode and think the remote is set to off.. then, the remote reads that the heater is off when it is not. You can easily have an entire hot “pool” instead of just a “hot tub”.. which has happened on several occasions!. I believe gas heats up much more efficiently than electric. The whole pool heated to 100* in less than one day in October. We had a fun time swimming in Fall.. not so fun pYing the gas bill.. But as I said, I am not an expert., and as described probably the dumbest pool operator ever. All I can do is wish you luck and hope someone better answers your question.. :-). Overall, the heater and this vendor was a good choice. It arrived quicky and works fine (needs servicing about once a year for something that we just don’t know what we are doing though.)
is there a left or right hand plumbing option?
A shopper on Feb 25, 2021
Does It heat pools and spas?
Ricky B on Jul 29, 2019
BEST ANSWER: It heats my whirlpool hot tub that is connected to my pool very well. To heat the pool would take a while but could be done.
Can I use this heater for an above ground pool ?
A shopper on May 11, 2020
BEST ANSWER: Unless you have a really big pool I think it would be very large. My pool is 21000 gallons and this was considered oversize for my application.
what size of gas supply line would I need for this model?
A shopper on May 6, 2018
BEST ANSWER: This heater needs a 3/4" gas line supply.(verified in installation manual)
A shopper on Apr 12, 2017
BEST ANSWER: This question is best answered by the Raypak authorized Dealer.. In my case ,the heater I was replacing was a Raypak 400,000 BTU unit so it was a no brainer. I would caution you to make known to the Raypak dealer whether your pool is fresh or salt water as it makes a difference in the heater model. A salt water pool requires a different heat exchanger than a fresh water pool. . Hope I have been helpful.......Bruce
is this the equivalent replacement to a p-r405b-en?
A shopper on Nov 6, 2016
BEST ANSWER: The letters and numbers in a model number have specific criteria to the specs of a unit, i, e , cupro nickel heat exchanger for salt water application etc, etc,... I strongly suggest you contact the customer service dept of the mfr so that they can match the unit you are replacing. Otherwise you may be purchasing a unit that has unnecessary options that add to the cost. I will say the unit i purchased is exactly what i needed , was functioning perfectly when i sold the home last year. Good luck ! I hope my input has been helpful.................
What year was this manufactured?
jessica on May 21, 2020
BEST ANSWER: my owners manual says its 6/19
what's gas psi you would need?
malcom j on May 21, 2020
BEST ANSWER: Have a 2 PSIG Line from House
Is this heater easy to winterize ?
A shopper on Apr 13, 2020
BEST ANSWER: Yes. Nothing special required.
On/off switch will not engage, is there a reset button?
Carrie N on Mar 20, 2020
BEST ANSWER: No you put a new switch in
Is there a remote control for the Raypak Digital Natural Gas Pool Heater 399k BTU | Electronic Ignition | P-R406A-EN-C 009219 P-M406A-EN-C 009965? I would like to be able to set the heater from my house.
Andrew on Sep 21, 2019
BEST ANSWER: Any pool automation system will work to accomplish this, there are around 100 systems available on the market. You could also use the fireman's switch connection to use a standard wall switch as well.
Is this heater ok for a saltwater pool?
A shopper on May 9, 2019
How much does it weigh?
Melvin P on Mar 18, 2019
BEST ANSWER: 238 lbs.
replacement for model P-R406A-EN-C, BTU/HR 399,000., MAX PRESSURE 125, NATURAL GAS ?
A shopper on May 21, 2018
BEST ANSWER: Best pool heater on market
Considering the Raypak P-R406A-EN-C 009219 as a replacement for my Laars LT400N pool heater. While BTHU, gas lline size and voltage requirements are the same, there may be differences in operating capability. Specifically; (1) Will the Raypak heater provide the power and control signal to operate my electric diverter valves (2 ea JVA 2440) to automatically diterct supply and return water to the spa or the pool when either of those are selected for heating, and; (2) Does the Raypak heater automatically extend the pump run time to cool the heater when the heater is shut off? I called Pool Supply with these questions but, since I don't hear very well, I am not sure of the answers. The technical spec or the operating instructions do not mention these features.
James H on Jan 11, 2017
BEST ANSWER: If I understand your question correctly I believe the controls to select which device receives the heated water is made by the computer that you select on your wall mounted pool control pad.. As far as the cool down feature the answer is yes it does. To be absolutely certain , you can download the heater installation guide before purchasing same. you will find your questions answered in there.. Hope I've been of some help.
do you have this heater in stock and what is delivery times?
A shopper on Oct 28, 2020
What would delivery date be if ordered tomorrow?
Steve L on Oct 5, 2020
My pool guy said that I need a 400,00 Nickel copper Rheem heater for my salt water pool? Which one would that be?
Craig W on Jun 15, 2020
How soon for deliveryHow soon can you deliver?
A shopper on Jun 15, 2020
I'm buying a 18 by 36 pool,what size heater should I buy?
A shopper on May 24, 2020
What size pool is this heater good for.?
A shopper on May 23, 2020
do i need a gas regulator with this 399k model if so what the psi i need?
malcom j on May 22, 2020
4.8 / 5.0
13 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 4 out of 5
Large volume of Water
We have a pretty large pool.This heater works great.Heats the pool within a couple of hours and thats what I was looking for in a heater.Great product you folks have here.
March 5, 2016
Rated 5 out of 5
Slick looking
I just had this Raypak installed and it heated my Jacuzzi from 80 to 102 in about 15 minutes! Very quiet and the digital panel makes it nice and easy to select a temp.
May 9, 2014
Rated 5 out of 5
Very Efficient Heater!
Once arrived, installer came for install and set up. Heats 2 degrees per hour in 15k gallon pool. Absolutely amazing.<br>
March 9, 2017
Rated 4 out of 5
Good one
Having a big pool,I need a heavy duty heater.I can count on this one to get the job done quickly and efficiently. Heats up the water right on time.
July 7, 2016
Rated 5 out of 5
Surprisingly quick delivery!
I ordered the new Raypak unit and it was delivered in 3 days. I hadn't expected to receive the unit that quickly. Delivery process was easy and efficient. Excellent experience all around.
June 9, 2021
11 months ago
Rated 5 out of 5
I had an old Teledyne heater that was all rusted and wouldnt fire. This new Raypak heater is much more efficient and has digital controls where I can set the temp I want instead of the old dial where you had to guess.
June 9, 2013
Rated 5 out of 5
Great heater an a reasonable price
This heater replaced an old Pentair MiniMax 400. Very easy retro install. Gas and water plumbing were in very similar locations. This heater brings our inground 33,000 gallon pool up from 77* to 84* in 3-4 hours.
July 13, 2020
1 year ago
Rated 5 out of 5
Replaced 19 year old Raypak
Not the fault of Pool Supply Unlimited, but the shipping company company delivered the unit a day later than scheduled. The delivery guy helped with moving the heater into the back yard.

The heater works flawlessly and the digital temperature control is a big improvement over the old analog control of the expired unit. This Raypak 406 heats the large spa quite quickly. I am happy with the purchase and customer service of Pool Supply Unlimited.
February 9, 2018
over 4 years ago
Rated 5 out of 5
Quiet, quiet quiet, easy install, fired right up! What more can I say
Love for the price, no will beat the price. However they are jerking me around on the damaged one they shipped me first. But will get it resolved sooner or later
July 4, 2017
over 4 years ago
Rated 5 out of 5
Great experience with pool supply.

I can’t fine an installer everyone is busy.
February 11, 2020
over 2 years ago
Extended Warranty Program
Raypak pool and spa heaters are engineered to perform and built to last. The brand you know and trust is bringing you more peace of mind with a 2-year extended warranty on residential pool and spa heating products. If not registered, warranty is only 90 days.
The benefits of Raypak's extended warranty, include:
  • 2-year extended warranty
  • Professional in person service
  • 24-hour or same-day service
  • Genuine Raypak parts
  • Factory technical support
The product registration process is quick and easy to complete. To take advantage of the extended warranty follow these steps:
  1. Have your pool or spa heater professionally installed. Click here for a list of Raypak installation partners.
  2. Register your product online at www.raypak.com/warranty within 90 days of installation.
Warranties are effective for products installed on or after June 17, 2019. See product warranty for specific details. Conditions apply. For full warranty by product including exclusions and how to make a claim, please visit www.raypak.com/warranty.
This information was updated on 4/23/2022. For the most current information and full warranty policy please visit www.raypak.com.

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Pool Supply Unlimited is an e-commerce company that loves water. We love to pump it, filter it, heat it, chlorinate it, light it up and stare at it while we're barbequing a fat, juicy steak. There are real pool professionals working here. Our guys have seen thousands of pools in their careers, no exaggeration. We are based in Southern California and can land most products to your door (within the 48 contiguous states) in less than a week.
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