// Initialize Pentair / Channel Advisor Sales Reporting sTrack.initialise();
Home Pool Pool & Spa Heaters Electric Pool & Spa Heaters Coates In-Line 1.5kW 120V Electric Heater | 1.5ILS
NOTICE: The pool & spa industry continues to face industry-wide shortages on many products that most vendors expect to last late into 2022. We're allowing items to be purchased so that customers who choose to wait will have their order shipped when product is available. Most vendors are not providing any ETA on when items will be available. WE WILL EMAIL YOU RIGHT AWAY IF YOUR ITEM IS BACKORDERED. 

Coates In-Line 1.5kW 120V Electric Heater | 1.5ILS

Coates In-Line 1.5kW 120V Electric Heater | 1.5ILS

Parts AvailableParts Available
Purchase Options
  • Coates Pressure Switch 1-5 PSI | 22007210
    Coates Pressure Switch 1-5 PSI | 22007210

  • Coates Pilot Light | Amber | 5/16" 250V | 29034620
    Coates Heater Pilot Light | Amber | 5/16" 250V | 29034620

  • Coates Heater Replacement Union 1.5ILS and 6ILS Models | Sold Individually | 32705020
    Coates Heater Replacement Union 1.5ILS & 6ILS Models

  • Coates Well for #22003820 4-1/2" Long | 22003251
    Coates Well for #22003820 4-1/2" Long | 22003251

  • Coates 22002001 Dry Well 8" | 22003250
    Coates 22002001 Dry Well 8" | 22003250

  • Coates 2-Pole Contactor | 35 AMP 240V | 21000650
    Coates 2-Pole Contactor | 35 AMP 240V | 21000650

  • Coates Thermostat TD103-77 CPH/PHS | 22002001
    Thermostat TD103-77 CPH/PHS | 22002001

  • Coates High Temperature Limit Switch | 22003820
    Coates High Temperature Limit Switch | 22003820

In-Line 1.5kW 120V Electric Heater
The built in pressure switch prevents operation when there is no water flow and allows operation at flow rates between 15GPM and 80GPM. The stainless steel tank is designed to optimize heat transfer by directing the water flow over the incoloy elements efficiently.
Compact and efficient, Coates in-line spa heaters feature stainless steel tanks and replaceable incoloy elements.
Standard Features
  • Pressure switch
  • Close differential thermostat
  • Control box with powder coat finish
  • Manual reset high temp limit
  • Element "on" light
  • Stainless steel tank
  • Replacable incoloy element
  • 1-1/2 X 2 inch union connections for PVC pipe
Technical Data
  • ILS BOX: 12"L x 6"W x 6"H
  • LENGTH (UNIONS): 19-1/2"
  • UL Listed for Indoor Installation

9 lbs.
10 lbs

Single Phase
Salt Compatible
Q & A
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 16 questions Browse 16 questions and 14 answers
would this heat a small 6000 gallon pool? It's temperature is usually 73-75 degrees... only looking to raise to around 80-83 degrees.
pammi on Apr 26, 2016
BEST ANSWER: You will need the 120V and also a 230V one to do the job. (Two of them together does pretty good). You do NOT use ground fault circuit breakers. Use the standard ones.
will this work for a 8000 gallon pool?
trina r on May 2, 2016
would this work for an intex above ground pool? Looking to heat the pool for night swimming. 15 x 48 4000 gallon pool. Just want to bring it up to a comfortable temp. Is this appropriate for this type of pool and what would be the recommended temp be? Does the chlorine and chem have any disadvantages to the heater? Do I pass the water through it after the filter pump to the pool?
Tonybaltierra on Aug 11, 2016
BEST ANSWER: this heater is just for a small pool - 8 ft x 8ft and you need a larger one. The chlorine and chemical will not affect the heater and you pass the water through it after the filter pump to the pool, I keep the temperature at around 87F
will this work for a 8000 gallon pool??
trina r on May 2, 2016
Does this have a regular plug?
A shopper on May 27, 2018
Does it require an ON/OFF switch?
A shopper on May 31, 2016
BEST ANSWER: A standard circuit breaker is used as the switch on/off. If the water is moving and the breaker is on, it will come on. If the breaker is on and the pump is not moving the water it will turn off.
install on small pool ?
A shopper on Jun 29, 2016
BEST ANSWER: You did not say how small or above or in ground. I installed on above ground 15 FT dia and insulated the outside walls with 1" Styrofoam. I ran it for days to raise the temp to 82F. I then decided to ADD a 230 V one. That did the trick! With both, you can get the temp up in about 12 hours.
Will this work for a best way 16foot by 42 inch deep pool?
A shopper on Apr 3, 2022
BEST ANSWER: It would heat in a day or two (or three). The trick is to move the water through the heater very slo o o o wly, otherwise it doesn't have time to heat the water as it flows thru the heater.
Would this electric pool heater be sufficient for an above ground pool 10 x 15 ?
Emily on May 21, 2020
BEST ANSWER: This wouldn't be large enough for that size pool. It's a replacement for a Jacuzzi 2 person hot tub. I'm sure you could get a similar heater ONLY in a larger size for a pool and it would work. But this one would be sufficient for a pool of your size. THE AREA/MASS of water you are wanting to heat/warm would be far too great for this set up to be successful. Hope this is helpful
have a 3000 gallon above ground pool and want to maintain pool temp in 70's. I only have 120v would this work? Does the unit not come on if the temp is over 70, so I can set it and forget it? Will it handle outdoor sunlight exposure? I live in southern california.
peter s on Oct 6, 2019
BEST ANSWER: Unfortunately this unit is too small for an above ground pool. There isn't an electric heater on the market that will work for that application on 120V.
would this work for a 8000 gallon pool?
trina r on May 2, 2016
BEST ANSWER: The simple answer is no. I have a 230V plus a 120V for a 4300 Gal. It takes all night to raise the temperature by 8 degrees. I run solar (Home made--16 parabolics by PIPEtalk) to keep the temp up and them hit the electric ones to cap it off before swimming. Three 230V might do the job if you have time and money.
Could i Use this for my Koi Pond... Could it Run 24/7 i need to heat 300 gallon Tank to above 80 24/7?
Karlo B on May 29, 2019
I have an 18 ft round pool would this work? And do I need anything else.
VERONICA C on Apr 30, 2019
Will this work for a 28' above ground pool ?
Kimberly D on Jul 6, 2018
Will this heat a 15 foot 33 inch deep above ground pool? It is not saltwater. I just need to raise the temp 10-15 degrees
Connie R on Jun 21, 2018
I have a 14' x 48" above ground pool and we want to heat the to around 75. What size of heater do you recommend?
A shopper on Jun 13, 2018
4.0 / 5.0
3 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
Perfect Fit
If you are looking for an all-electric heater for your 800 gallon spa, this is it! This beauty is working amazing and keeping my spa just how i like it.
April 2, 2016
Rated 3 out of 5
Works well.
Does what it is supposed to do, heats my small spa perfectly. I only have to wait a couple minutes but after that everything is good and hot. Great value.
April 2, 2016
Rated 4 out of 5
No pre- wire. You should wire electrical for your own risk but it is not easy for DIY
April 30, 2019
over 4 years ago

Coates recognizes that the internet is an important source of information and a growing channel for selling many products. However, we strongly believe that pool heaters are not appropriate products to sell over the internet.

The installation of an electric pool heater is generally regulated by multiple sets of laws, codes and guidelines, at the federal, state and local levels. Further, the failure to properly install an electric pool heater can raise personal safety and performance concerns.

For this reason Coates do not authorize online retail sales of any of their pool heaters. An online purchase may affect your warranty.

This policy is necessary to ensure that Coates Heater brand equipment is installed properly, in compliance with applicable laws, rules, codes, and in a manner that addresses safety concerns and the proper performance of Coates equipment.

Your local pool dealer is the best resource for your pool and spa needs, including any warrantable defects in their products.

Hay muchas maneras diferentes de contactarnos, y nos gustaría hablar con usted sobre las preguntas de su compra, ayudarle a diagnosticar los problemas de su equipo y escuchar acerca de cómo podemos mejorar y todo lo que está en su mente.
Click Here
6am - 6pm Monday thru Saturday
Pacific Standard Time
Will-Call Hours Click Here
Be the first to know the latest news, deals & special events!


By signing up you indicate that you agree to the terms of our privacy policy.

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.
Visa Mastercard Discover American Express PayPal