By Raypak



Model # R-17121

Warranty 1 Year

Manufacturer Code 017121

Dimensions 12-1/4" x 8-7/8"

Alternate Part #'s 017121, ELS-R-0005-1-T1, RAY17121, ELSR00051T1, RAY017121

Product Description

The Electric 3-Series Titanium heater is the latest technology in pool and spa heating. The E3T is built with titanium heating elements and 316L stainless steel to withstand extreme pool water conditions, including saltwater chlorinated pools. The E3T heater operates by utilizing the latest solid-state design and flow sensor technology. It has easy to use digital controls with diagnostics. The compact size makes it is easy to install for new construction or replacement installations.

Built-in intelligence.
The E3T is equipped with easy to use digital controls and diagnostics. Our digital control center shows the desired set point and lets you set the temperature exactly where you want it. The easy to read display allows you to see temperature, GPM flow, and diagnostics. The intuitive alert system keeps you informed.

  • Main Features: 

Titanium Element
The E3T has a robust titanium heating element that not only prolongs the life of the heater, but allows it to work in extreme pool water environments, such as salt water chlorinated pools.

316L Stainless Steel
316L stainless steel is used in the construction of our heaters. This high grade, corrosion resistant steel is especially suited for saltwater heating applications.

Flow Sensor Technology
E3T operates by utilizing the latest flow sensor technology instead of the traditional pressure switch activation. Our heater is programmed to have a minimum flow activation rate of 15 Gallons Per Minute, this helps protect the elements and prolong their lifespan.

Solid State Design
The E3T uses solid state controls to eliminate noisy and troublesome contactors providing quiet, reliable operation. The advanced design allows the heater to modulate power, only using the energy necessary to maintain the desired temperature.

Ready To Install
E3T pool and spa heaters are compact, come standard with union connections, and are easy to install. They are the perfect solution for a new pool or spa, as well as to replace any existing pool or spa heater. Available in 5.5, 11, 18 and 27 kW.

Product Specifications

5.5 kW
18,767 BTU
12-1/8 in.
9 in.
4-3/4 in.
Port Size:
1.5 in.
1: 30 Amp Breaker
Heater Type:
Heat Exchanger:
240 V

?     Asked on 5/26/2019by Pool spa

I have a 4’ wide by 3 1/2” deep pool spa. The current heater is dead. Can I use this to replace my old one ?

A  Answered on 5/26/2019 by InyoPools Product Specialist Patrick P.

Please review this Document on Electric Heater Sizing for Spa Use to see if the 5.5 KW will meet your heating needs, you may need to go up to 11 KW. Look under the section labeled for Residential Use.

?     Asked on 6/18/2019by Inyo Visitor

24x24 above ground pool . . good for this size pool?

A  Answered on 6/18/2019 by InyoPools Product Specialist Lennox H.

Hi. The E3T Electric Digital Pool/Spa Heater - 017123 (18kW) or 017124 (27kW) will work more efficiently for your size pool. 

?     Asked on 6/19/2019by Marco Muniz

Is good for semiground pool 15x30? And do you know is for bill by month in comed?

A  Answered on 6/25/2019 by Raypak

Good Evening!! Thank you so much for your interest in our product!! A 5.5kw is typically a unit best suited for a small spa. However, we do have larger versions of this unit in 18kw & 27kw that may be able to dothe job in either a one or two unit configuration depending on other parameters of jobsite and your expectations. Would you like for us to perform a complete sizing of your pool? Thanks again for your interest and please let us know if you would like for us to help you further!!

?     Asked on 10/23/2019by OLIVE COOPER

We have a 30,000 gallon pool. What unit do you recommend?


A  Answered on 10/23/2019 by InyoPools Product Specialist Lennox H.

Hi, Olive. You will need multiple 27kW - 017124 models to effectively heat your pool based on the desired temperature. Use the Electric Heater Pool Sizing Guide for more info.  

?     Asked on 3/20/2020by Inyo Visitor

I read in the manual: "Spa models (ELS 0005 and 0011) are supplied with 1-1/2" NPT inlet and outlet plumbing connections". Does it mean that include PVC union fittings?

A  Answered on 10/15/2020 by InyoPools Product Specialist Andy O.

Hello- They all come with plumbing connections, the 5.5 KW, and 11 KW come with 1.5" connections, and the 18 KW and 27 KW come with 2" connections. They are the ones on the left of the picture 



Est. Repair Time

2 to 4 hrs

Tools Needed

Screwdriver, Pliers, Plumbing supplies

5     0

Wanted to heat hot tub

Written on 2/23/2020 by Guest

Easy install with basic wiring and plumbing knowledge, heated my 600-gallon spa from 64 to 104 in about 6 hours with outside temp around 50 degrees Fahrenheit

Were these instructions helpful? 


Review Summary

 (Average 0  out of 5 stars)
0 Rating
5 star:
4 star:
3 star:
2 star:
1 star: