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Caldera Spa Highland Series Heater 4kw 240v 73994 Replaces 73994

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  • Caldera Spa Highland Series Heater 4kw 240v Replaces 73994 WAT73994
  • pressure switch tap
Now: $287.77
RRP: $325.89


Caldera Spa Highland Series Replacement Heater WAT73994 or 73994 is a 4 Kw, 240 Volt spa heater.

Replaces Part Number C2400-C3330-1C and Caldera Part Number 73994. This heater includes the pressure switch.

This heater is the correct replacement heater for a Hot Spot Relay.

Caldera Spa Highland Series Heater 4kw 240v 73994 Replaces 73994 and is now made by Hydroquip.

Distance between the 2 main posts is 1 1/4 inches.


top section of heater
Heater is 18 1/2 inches long measured end to end from heater tailpiece to tailpiece.

 220 Volts, 4.0 kW, 18 Amps

 Need the heater without the pressure switch? See 73994HS

Or see/compare C2400-5003 4kw 15 inch replacement heater

4 kw 240 volts 2.25" x 15" stainless steel tube factory replacement.

Note for installer:
It is best to use two small wrenches to loosen the nuts that fasten the heater connecting bars since damage to heater element may occur with a single wrench. Then disconnect the ground wire attached to heater.

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Warranty Information

Manufacturer's Warranty
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1 Review

  • 5
    Right part, fair price!

    Posted by Barry on 23rd May 2017

    This heater was an exact replacement for the original in my Caldera C45 spa at a fair price. Highly recommended.

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