• Service & Repair
  • Hot Tubs for SaleCOMING SOON
  • Shop By Hot Tub Brand
  • Shop By Parts Brand
  • Our blog
  • Contact us


Please Note: During the UK's school holidays orders are still being shipped as usual but our customer services/technical support will be operating by email only.

Please email [email protected] or use our contact us page. Thank you for your understanding.


HydroQuip 2.5kw Flow Thru "Challenger" Heater

1 item(s)
(0 reviews) Write a review
Price to buy in points:3880 points
You save: £2195
(£19400 Ex. VAT)
RRP ex VAT: £21595

2.5kw Flow Thru heater also known as the Challenger heater, common on Gulf Coast Spas & Hydroquip packs. 

Add to cart
Delivery Options
Payment Methods


  • PayPal
  • SagePay
  • Credit Cards
  • Debit Cards
Why Choose us


  • Fast UK & EU Delivery
  • Free UK Next Day Delivery, Spend £100
  • Free Technical Support
  • A Family Run Business Who Cares
  • 5 Star Rating on Trust Pilot
  • 1 Year Manufacturers Warranty
  • No Quibble Returns Policy
  • 25 Years of Unrivaled Parts Knowledge
HydroQuip 2.5kw Flow Thru "Challenger" Heater
1 item(s)
(0 reviews) Write a review

HydroQuip 2.5kw Flow-Thru "Challenger" Heater

This is a HydroQuip 2.5kw Flow-Thru replacement heater assembly for the model known as the "Challenger" Heater. The Challenger heater can rarely be found attached to some blue-faced Hydroquip & Gecko control packs.


Supplied complete with 2x new O-ring gaskets, 2x 2" heater unions and tailpieces.

Tecmark 3902 Pressure switch sold separately here.



Volts: 230

Hz: 50

kW: 2.5

Amps: 10.0 - 10.5

Heater Element Material: Incoloy

Sensors: Temperature and high limit (sold separately)

Flow Detection: 2 PSI Pressure switch

Part Number: C2250-0309ET


Length: 380mm

Total Length: 495mm (including unions)

Diameter: 60mm

Distance Between Terminals: 32mm




Plumbing: 2-inch unions, female collars thread onto the spas existing male plumbing tailpieces. (Internal thread diameter of the female collars are 78mm).


Electrical: The pressure switch is connected by two insulated spade connectors and this cable has a two-pin plug which plugs directly onto the PCB. The heater tube has a metal pouch on the side for the hi-limit sensor probe to sit inside. Heater terminals are connected by two power wires from the PCB and secured by two 3/8" nuts.

Fixings: This type of pressure switched heater is secured onto the HydroQuip control box by two threaded studs at each end of the heater and secured in place by two 3/8" nuts.

Compatible Control Boxes

HydroQuip and some Gecko Spa control boxes.

Fits Spa Brands

Gulf Coast Spas and others.



Additional Information

When connecting the two power wires from the PCB to your new heater terminals be very careful and hold the base of the terminal with a small 1/4" spanner or long nose pliers before tightening the two 3/8" nuts up on top. This is a genuine Balboa product, stay well clear of cheap internet copies.

Need Help?

If you require any help with choosing your replacement hot tub heater please do give us a call or email us through our contact us page. We many years of hands-on experience with all makes and models of hot tubs and spas.

Therm Products
Product Type:
Spa & Hot Tub Heater Assembly
Part Number(s):
kW Rating:
Element Material:
Flow Detection:
Pressure Switch
Sensor Type:
Hi-Limit Sensor in External Pouch
Terminal Distance:
Plumbing Union Size:
2” (78mm thread OD)
Pipe Connection Size:
2” female socket (60mm ID)
380 mm
Tube Diameter:
60 mm
Average Star Rating:
0.00 (0 reviews Total)
  • 5 stars
  • 4 stars
  • 3 stars
  • 2 stars
  • 1 star
Have you used the product?
Tell us something about it and help others make the right decision
Show reviews with:
5 stars (0 reviews)
4 stars (0 reviews)
3 stars (0 reviews)
2 stars (0 reviews)
1 star (0 reviews)

No reviews found

You may also like