6 kW Inline Baptistry Heater Only - 6HHL

Part # 9521-0

By Little Giant Pump. Co.

  4 Average  



Part # 9521-0

Manufacturer Code 6HHL

Alternate Part #'s 6HHL, 6X1, SP-9009-7, 46-234-1002, LGM6HHL

Product Description


Electric Circulation Water Heater

Built upon family values and premium service, Little Giant Manufacturing has over a century of experience serving churches and religious facilities worldwide. For our clients who require permanently placed baptistry heating, Little Giant electric circulation heaters make water-warming efficient, simple and affordable.

No matter what the size, each externally mounted electric circulation heater offers a number of cost-effective benefits, including:

  • High-performance, energy-saving adjustable thermostats
  • Oxidation-resistant, Incoloy steel heating elements
  • Fiberglass insulated designs
  • Range of heater sizes (depending on water volume and temperature requirements)
  • 1/40 HP, 230volt circulation pump (600 GPH at one-foot head) (SOLD SEPARATELY)
  • 118-degree high-limit switch

Little Giant electric circulation heaters are UL-listed and designed for use with a 240V single-phase power source. If necessary, however, they can be used with a 208V source (with 25-percent heat reduction) or a 120V source (with 75-percent heat reduction).

When you’re retrofitting an existing baptistry or installing a new fiberglass model, Little Giant’s electric circulation heaters are a cost-effective, dependable option.

Contruction Features

  • Incoloy steel heating elements
  • Adjustable thermostat 60°F-107°F range (2 degree diff.) on 6 KW heater
  • Adjustable thermostat 47°F-107°F range (4 degree diff.) on 11.5 KW heater
  • Well insulated with fiberglass
  • For use with 240V single phase power
  • Can be used with 208 Voltage, but heating is reduced 25%
  • Can be used with 120 Voltage, but heating is reduced 75%
  • Hi-Limit switch set at 118°F (± 4°)


Part Number Model Volts Watts "A" "B" "C" Inlet or Outlet Amps Drawn
3HHL 3 KW 240 3000 22" 16 3/8" 5 1/2" 1" F.S.P.S. 12.5 amp
6HHL 6 KW 240 6000 27" 21 3/8" 5 1/2" 1" F.S.P.S. 25 amp
11.5HHL 11.5 KW 240 11,500 29 1/2" 24 3/4" 4 3/4" 1" M.S.P.S. 47.9 amp



Circulated Heating Dimensions




Product Specifications

6 kW
240 V
6,000 W

?     Asked on 8/16/2021by Inyo Visitor


A  Answered on 8/17/2021 by InyoPools Product Specialist Craig C.

Hello,  The Little Giant Pump Co. 6 kW Inline Baptistry Heater model 6HHl is UL Listed.

?     Asked on 1/5/2021by C.D. Bud Gentry

Our Little Giant heater has served us well. I turn it on Saturday nights for Sunday morning. I had a baptism this past Sunday and the water was very cold. Heater and pump were not working. I checked it today and when I press the reset button on top and then turn on heater and pump, the red light comes on and everything works for about 30 seconds and then the light goes off and everything shuts down. What do I need to replace?

A  Answered on 2/5/2021 by InyoPools Product Specialist Megan C.

Unfortunately, we do not have the resources to provide troubleshooting for this heater. Please contact Little Giant Manufacturers directly at https://little-giant.com/product/11-5kw-water-heating-circulation-system/ 

?     Asked on 7/20/2020by Inyo Visitor

Please let me know what manufacturer warranty is available for this unit. Thank you.

A  Answered on 11/16/2020 by InyoPools Product Specialist Hector F.

Hi Ronald, this heater has a manufacturer's 1-year warranty for repairs. 

?     Asked on 3/31/2020by Inyo Visitor

I have the 6kw Baptistry heater with the water level sensor is there a wire diagram available to look at

A  Answered on 4/1/2020 by InyoPools Product Specialist Lennox H.

Hi. The 3kW & 6kW Wiring Diagram is all that is available. 

?     Asked on 3/17/2020by Inyo Visitor

I need a wiring diagram for the 240 volt system wires in side the box where the heating element hooks up

A  Answered on 3/18/2020 by InyoPools Product Specialist Lennox H.

Hi. Use this 3kW & 6kW Wiring Diagram as a reference. 

?     Asked on 2/26/2020by Inyo Visitor

How long can this unit stay in the "on" heat position. It will be on a 800 gl. Baptistery and wanting about 100 to 105 degrees. Ambient temp is about 70 degrees.

A  Answered on 2/27/2020 by InyoPools Product Specialist Lennox H.

Hi. If the water temp is also 70 degrees, it will approximately 10.3 hours to achieve the desired temperature increase.

?     Asked on 10/28/2019by Billy Mitchem

On The thermostat it has Lo 9-8-7-6-5-4 > Which setting is the hottest for the water?

A  Answered on 10/28/2019 by Industry Professional

The highest number is the hottest setting. 

?     Asked on 2/4/2019by James Cotton

is this little giant model 6HHL 240v and 90 gal per/m

A  Answered on 2/6/2019 by InyoPools Product Specialist Steve M.

Hello James- This is the 6HHL Little Giant Heater. It is 240v. The flow rating on it is about 10GPM with 1ft of the dynamic head. 

?     Asked on 1/20/2019by Don

Are these units supposed to be stood up as all illustrations show or can it be laid down on its side and still function properly?

A  Answered on 1/21/2019 by InyoPools Product Specialist Lennox H.

Hi, Don. These units must be installed vertically per the manufacturer's installation requirements. 

?     Asked on 3/8/2018by phil

my church has a little giant le model number 6hhl the heater was left on after the pool was drained. does your company offer heating elements for sale and would that be all that is needed or do i have to replace whole heater.

A  Answered on 3/8/2018 by InyoPools Product Specialist Lennox H.

Hi, Phil. We do offer replacement parts for that unit, click this link > Complete Baptistry Heaters and Replacement Parts

?     Asked on 1/26/2018by Charles kinney

Just installed new 6kw heater and would like to know if light on thermostat is supposed to be on when in operation?

A  Answered on 1/26/2018 by InyoPools Product Specialist Lennox H.

Hi, Charles. The indicator light will be on until the water reaches the set temperature. 

?     Asked on 7/20/2017by Inyo Visitor

I have a 400 gallon indoor spa. Will this heater be sufficient and want is the average temp res per hour?

A  Answered on 7/21/2017 by InyoPools Product Specialist Lennox H.

Hi. This heater is not meant for spa or hot tubs but for Baptistries.  

?     Asked on 12/7/2015by Welton

I have a Little Giant hot water, how can I tell if it is heating the water and how long should it take to heat the water in a 500 gal. baptistery? Thanks

A  Answered on 12/9/2015 by InyoPools Product Specialist Lennox H.

ccording to spec this unit "heats 100 gallons per hour - 30° Rise".

?     Asked on 10/28/2015by Bruce Vinson

does the unit i am looking at which say 6 kw inline baptistry heater come with the thermostat?

A  Answered on 10/29/2015 by InyoPools Product Specialist Joe S.

Hello Bruce, this unit does come with the Thermostat.

?     Asked on 6/7/2015by Jeff Jones

What is the center line measurement between the inlet and outlet?

A  Answered on 6/7/2015 by InyoPools Product Specialist Patrick P.

The centerline measurement between the inlet and outlet port measures 23" you may also see Detailed Dimensions of This Baptistry Heater here.

?     Asked on 4/1/2015by Pat Mitchener

The heater turns the thermostat to high the longer it runs?

A  Answered on 4/6/2015 by InyoPools Product Specialist Brian M.

The tech at Little Giant wanted me to ask a few questions : The first would be how old the heater is? He said the older it is the points would stay closed in the thermostat the water would just keep getting warmer. If the points were open, it would never get hot. A new thermostat would be part number 9523-11.  According to the tech,  and depending on the age of your heater, a new one may be the best bet. That part number 9521-0