Watkins / HotSpring 4kw No-Fault Heater Element 1995-Current 73791

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  • $377.70
  • Regular price $453.00

Watkins / HotSpring 4kw No-Fault Heater Element 1995-Current 73791

TITANIUM HEATER!  -- watch out for internet knock-off Watkins heaters that are NOT Titanium, nor Factory. Any heater that is not titanium or that has a reset button is NOT a Watkins factory heater, but a knock-off.

73791 Watkins PDR (Power Down Reset) Heater Assembly, 4kw (220/230V spas) - is used in the following spa models:

HotSpring: Aria, Envoy, Grandee, and Vista models use PN 73791 4kw Heater (the Classic, Jetsetter, Prodigy, Sovereign, and Vanguard use the 73790 6kw heater Heater)

Tiger River: Caspian uses the 73791 4kw Heater (the Sumatran and Bengal use the 73790 6kw heater)

Limelight: all Limelight Spas by Hotspring use the 73791 4kw Heater


What's Included: Watkins No-Fault PDR Titanium Heater, 1/4" vinyl tubing 12", 1/4" clamps & thermistor o-rings, and easy-to-follow install instructions for the DIYer. ALSO INCLUDES instructions for making a BYPASS JUMPER from your old heater (if necessary).

Description: This version No-Fault PDR (Power Down Reset) Titanium Heater is the newest universal replacement heater from the makers of Hot Springs spas. Its double-pass sleek design replaces all previously discontinued heater styles that are listed below. The double-pass feature efficiently heats the water in two stages. Now factory approved and warranted for all 230volt installations for 1995-Current Hot Spring and Tiger River spa models. This heater replaces all No Fault® 6000 heaters, Watkins Hot Spring No Fault® 5500 cartridge heater elements, No-Fault 6000 cartridge heater replacements.


It is our recommendation that when replacing an older heater to consider replacing the two thermistors that are connected from the heating element to your spa's control board. These thermistors are the Control-Stat and the Hi-Limit thermistors. We carry both in stock. See below for the correct thermistors for your model year spa:

Model Years 1995-2001: PN 38416 Hi-Limit & PN 38415 Control-Stat

Model Years 2002-Current: PN 39525 Hi-Limit & PN 39530 Control-Stat


We ship within 2 business days (oftentimes same-day). When item closes over a weekend or holiday, we will ship the next business day. We ship via USPS Priority Mail and/or FedEx Ground. If you prefer faster shipping, please make comment in check out process, or call/email us. We will attempt to accommodate your request. Tracking is always provided to buyer.

FREE SHIPPING on ORDERS totaling OVER $300 (see listings for details. USA customers only). Tracking information sent to buyer on all orders. Typically we can ship SAME-DAY if order is received by 1:00 PM (MST) on normal business days. Otherwise, we ship within 2 days.

If you DO NOT see an item that you NEED for your Watkins manufactured spa (HotSpring, Limelight, Tiger River, HotSpot, Solana) - please EMAIL US! We may just have it and we can provide you a quote. Please email us.

How to Find your Spa Serial Number?

If emailing or calling us about your spa, it is helpful to know your Spa’s Serial Number. Typically, your spa serial number decal will be inside the hot tub equipment compartment, attached to the spa shell wall. It will say the Manufacture Name (Watkins), the Model Name, and then a Serial Number. If you have any questions of how to locate the spa SN, or how to determine information of your spa by its SN, please email us.