Model # H100ID1

Alternate Part #'s HAYH100ID1

Product Description

Hayward has developed an induced draft heater for above-ground pools and spas that combines state of the art technology with ease of operation and superior performance.

Featuring an electronic, direct spark igntion system and an energy-efficient FireTile lined combustion chamber, the Hayward heater provides 100,000 BTU input, while delivering 81% thermal efficiency and quick heating.

An integral induced draft system makes this heater completely impervious to any high wind situations. A one-piece copper header/heat exchanger provides for leak-free performance. And a simple plug-in 120 volt electric cord is provided for simple installation.


  • Outdoor Use Only
  • Aboveground Pools
  • Spas (above 70 GPM an external bypass is recommended)
  • Flow Rating 20 - 70 GPM's


  • 100,000 BTU input for above-ground pools and spas of all types and sizes
  • Electronic, direct-spark ignition for total control and automatic operation
  • Revolutionary induced draft technology ensures optimum heating and all-weather performace, even in high wind situations.
  • Reduced emissions design provides environment-friendly heating
  • FireTile combustion chamber ensures quick heating
  • Jet ported Eugenox burners provide long life and easy maintenance
  • One-piece copper header/heat exchanger for leak-free performance
  • Cool-to-the-touch cabinet surface temperature ensures worry-free use
  • Plug-in 120 volt electric cord for easy installation


  • Includes test strip kit for fast and accurate testing of water chemistry

Product Specifications

100,000 BTU
Cord Length:
3 ft.
Plug Type:
120 V

?     Asked on 7/2/2020by Joseph Cervantes

is this unit available?

A  Answered on 12/14/2020 by InyoPools Product Specialist Hector F.

Hi Joseph, unfortunately, this unit is no longer available however we do have the Ray Pak heater 014779.model that matches the Hayward model. 

?     Asked on 9/6/2019by Mo

I bought a H100DI 2 weeks ago and it was installed for me as an exact replacement to an old one for my spa. It does not work. Who should I call to fix the problem? it is under warranty and I need to know who should I call to fix it. I live in Canton MA zip 02021

A  Answered on 9/6/2019 by InyoPools Product Specialist Lennox H.

Hi, Mo. You will need to contact the place of purchase or Hayward Product Support to initiate a warranty claim.

?     Asked on 6/4/2019by Pawel

Can I use propane exchangeable regular tank for this heater ?

A  Answered on 6/7/2019 by InyoPools Product Specialist Lennox H.

Hi, Pawel. You cannot, this is a natural gas unit. 

?     Asked on 5/29/2019by Steve Leamy


A  Answered on 5/30/2019 by InyoPools Product Specialist Kevin G.

Hello,This is a natural gas heater. If you are looking for a heat pump, please see here.

?     Asked on 5/26/2019by Robert

I have a Hayward 100d heater when I turn on the heat it starts making a clanging noise what is the problem?

A  Answered on 5/30/2019 by InyoPools Product Specialist Michelle B.

Hello, We recommend contacting the manufacturer on that question. You can reach them at 908-355-7995.

?     Asked on 3/8/2019by Inyo Visitor

Can this 100000BTU heat a pool of 12x22x4' ? Thanks Harry

A  Answered on 3/11/2019 by InyoPools Product Specialist Michelle B.

Hello, We recommend a minimum of 125k btus for your size pool.

?     Asked on 2/13/2019by RICKY B

Interested in the 120v electric heater. A) can it heat a 5k gallon brick bath spa B) Does this have a temp controlled timer automatic C) Can this be used for an inside pool heater and machine left inside

A  Answered on 2/13/2019 by InyoPools Product Specialist Lennox H.

Hi, Ricky. This heater can heat a 5k gallon brick bath spa, is equipped with a thermostat; however, cannot be installed indoors. The Universal H-Series Low NOx Heater 150K BTU - NG - H150FDN will meet all your requirement. You will also need the Indoor Vent Kit

?     Asked on 1/28/2019by Suzanne

How big of a pool will the Hayward h100id1 heat?

A  Answered on 1/28/2019 by InyoPools Product Specialist Lennox H.

Hi, Suzanne. This heater will heat a pool that is 300 sq. ft or less. 

?     Asked on 12/9/2018by Ray

Are there any restrictions on using this heater in California?

A  Answered on 12/10/2018 by InyoPools Product Specialist Lennox H.

Hi, Ray. The South Coast Air Quality Management District ( SCAQMD) Area of Jurisdiction REQUIRES a Low Nox Heater be installed.  The following 6 California Counties are affected:  Los Angeles, San Bernardino, Ventura, Orange, Riverside, & Kern. Installing a non-compliant heater in these counties will void the manufacturer's warranty and could result in a fine from your local code enforcement. This unit is not compliant if you're located in one of these counties. 

?     Asked on 9/8/2018by Kara

We have 24 foot circular pool 52 deep. What size or model do we need. What’s most efficient and less costly to run. Do I still run pump with this ?

A  Answered on 9/18/2018 by InyoPools Product Specialist Lennox H.

Hi, Kara. This 100k BTU Heater will be sufficient to heat a pool your size. A Heat Pump is more efficient to run and both units will use your existing pump. 

?     Asked on 8/30/2018by Inyo Visitor

I have 12x24 above ground swimming pool is 100000 btu will be ok .

A  Answered on 8/31/2018 by InyoPools Product Specialist Lennox H.

Hi. This Hayward 100,000 BTU Heater will be able to heat a 12'x24' above ground pool effectively. 

?     Asked on 8/20/2018by Inyo Visitor

Does this electric heater a 220 or will a 110 work?

A  Answered on 8/20/2018 by InyoPools Product Specialist Lennox H.

Hi. This unit is 120 volts only. 

?     Asked on 7/30/2018by j

Purchased H100Id1 gas heater, works great but sound like a small tea kettle whistling when burner kicks in. low water flow is not the issue.

A  Answered on 7/30/2018 by InyoPools Product Specialist Lennox H.

Hi, J. You may have air in your gas line or have low gas pressure. 

?     Asked on 6/26/2018by Jeff Ladesic

What does the water pressure Switch pressure have to be we cant get heater to start, We were told the is no water going through heater pressure sitch, But when tech held switch oen pump fired. Hearyer Model H100Id1

A  Answered on 6/26/2018 by InyoPools Product Specialist Lennox H.

Hi, Jeff. The water pressure switch is activated with a flow rate of 20 - 70 GPM's. 

?     Asked on 6/25/2018by Inyo Visitor

What size heater would be sufficient to heat an above ground pool 12x24?

A  Answered on 6/25/2018 by InyoPools Product Specialist Lennox H.

Hi. A 100,000 BTU unit will be sufficient to heat a 12'x24' above ground pool. 

?     Asked on 7/23/2017by Mark S

I have this heater in my new semi inground pool. Heater and filter are surrounded by fence and top has mesh, but floats are on top of mesh almost enclosing it. Is this okay for gas exhaust? Its a little stinky when i go in, but still definitely airy and in no way considered totally closed in.

A  Answered on 7/25/2017 by InyoPools Product Specialist Lennox H.

Hi, Mark S. Unfortunately, that is not okay. This unit requires an unobstructed clearance at the top for ventilation purpose. 

?     Asked on 6/12/2017by LUIS M BELLO

does a red blinking lite on the ignition module mean its bad ? H100ID

A  Answered on 8/5/2017 by InyoPools Product Specialist Alex V.

Luis, I was unable to locate a trouble shooting guide for this heater. I would recommend calling Hayward at 888-429-9273. They will be able to assist you. 

?     Asked on 5/16/2017by Inyo Visitor

i have a Hayward heater 100,000 btu heater and 10x18 pool. How many hours will I have to run it to heat to 82 degrees

A  Answered on 5/20/2017 by InyoPools Product Specialist Lennox H.

Hi. You can expect a 1.9 degree temperature increase an hour using this heater to heat a 10'x18' pool.

?     Asked on 2/23/2017by JOE

Any reason this can not be used with a 9000 gallon Viking in ground fiberglass pool? Listed as an above ground heater.

A  Answered on 2/23/2017 by InyoPools Product Specialist Scott W.

You could use that heater, probably will not be too efficient, but you could use it. If you are wanting a natural gas heater I would recommend at least the H150FDN. For a pool, it will be most efficient to get a heat pump, part number HP21004T.

?     Asked on 2/5/2017by Manny F

Which pool heater will be ideal for use with salt water?

A  Answered on 2/6/2017 by InyoPools Product Specialist Andy O.

Hello Manny- For salt water pool applications we highly recommend getting a Cupro-Nickel unit. The Cupro-Nickel heat echangers can take more abuse from minerals than the standard copper tubes. Here is a link to the Hayward units that are Cupro-Nickel.

?     Asked on 2/3/2017by Bob

I have been told by dealers not to heat my pool because the internal components deteriorate quickly, within a year to year and a a half, if the water Ph and chlorine levels are not perfect 24/7. Is there any validity to this?

A  Answered on 2/3/2017 by InyoPools Product Specialist Scott W.

That is true for saltwater pools. For saltwater pools, I recommend a heater with a cupro-nickel heat exchanger which extremely retards the corrosion factor. With chlorine pools a heater with a regular heat exchanger will last, just depends on amount of use.

?     Asked on 7/26/2016by Inyo Visitor

Can I use an additional pool pump to run this type of heater ( separate from the filter pump)

A  Answered on 7/31/2016 by InyoPools Product Specialist Lennox H.

Hi, You can but it will be pointless because you will need to add another filtration system to filter the water going into the heater.

?     Asked on 7/21/2016by odonnell sandra

My heater will not click on in the morning. I turn the on-off switch OFF at night. Should I leave it in the on position and just turn down the heat button all the way.

A  Answered on 7/24/2016 by InyoPools Product Specialist Lennox H.

Hi, It's better to use the On/Off Switch when the heater is not being used. You will have to investigate the cause of why the heater is not turning on. The Hayward Heaters Above Ground Manual has a few troubleshoot tips you can try.

?     Asked on 5/23/2016by Joe

Can a propane heater be converted to natural gas?

A  Answered on 5/23/2016 by InyoPools Product Specialist Patrick P.

Yes the Hayward H100ID1 can be converted to natural gas by using the Hayward H100 Propane to Natural Gas Conversion Kit.

?     Asked on 11/10/2015by fran

does Hayward make a propane adapter for this heater

A  Answered on 11/10/2015 by InyoPools Product Specialist Charlie R.

Fran, The conversion kit from Natural gas to propane for this heater is part # 6223-79

?     Asked on 7/6/2015by Inyo Visitor

What size pool will this heat? I have a 18 x 33 above ground.

A  Answered on 7/6/2015 by InyoPools Product Specialist Dennis R.

Your selection of heater size depends on many factors but primarily on how fast you want to heat your pool. This 100,000 BTU heater would raise the temperature of your 15,000 gallon pool roughly 3/4 degree per hour.

?     Asked on 6/1/2015by Inyo Visitor

Does this heater hook up to a normal sized pool hose or do I need to buy adapters to change size?

A  Answered on 6/1/2015 by InyoPools Product Specialist Dennis R.

This heater now has 2" couplings for the piping. If your pool piping has 1 1/2" piping, you will need to buy 2" to 1 1/2" adapters.

?     Asked on 2/15/2015by Inyo Visitor

Can you use the H100ID1 Hayward pool heater on a salt water pool?

A  Answered on 2/16/2015 by InyoPools Product Specialist Robert M.

The H100ID1 can be used on a salt water pool. However, we would recommend a unit with a cupro-nickel heat exchanger. The cupro-nickel heat exchanger is much more durable than the copper exchanger used in the H100ID1. The H150FDN has a cupro-nickel exchanger and would be better suited for salt water.

?     Asked on 10/8/2013by Guest

Where can my heater be installed?

A  Answered on 10/8/2013 by InyoPools Product Specialist Patrick P.

There are specific venting requirements and clearance distances that must be met to ensure proper operation. Consult the owner’s manual for exact specifications for your model of heater.NOTE: Gas fired heaters should be diagnosed and repaired by trained personnel.

?     Asked on 1/22/2013by Guest

Can the Hayward H100 heater be converted from gas to propane?

A  Answered on 1/22/2013 by InyoPools Product Specialist Patrick P.

Yes, to convert from natural gas to propane, you would need part #6223-79.

?     Asked on 10/10/2012by Guest

What is the difference between an Electronic and Millivolt ignition?

A  Answered on 10/10/2012 by InyoPools Product Specialist Patrick P.

The basic answer is that Millivolt is the old style of ignition, using a standing pilot light. While the electronic ignition uses a spark start system like a gas grill. Electronic ignitions are more efficient in gas usage and also are better suited for high wind areas where a pilot light might get extinguished.