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SpaGuts Universal Inline Bath Heater Kit, Vacuum, 650W, 110V, Piggy, 7.0 in. x 1.5 in.

SpaGuts brand Universal Inline Bath Heater Kit, 650W 110V with Piggy Back Style Plug. This is the 7.0 x 1.5 inch in-line style bathtub heater with Vacuum Switch to be installed on the suction end of your bathtub pump.

This bath heater includes a Special Piggy Back style plug that provides an additional 110V plug-in outlet for up to a 1.5HP 9.5A 110V bath pump. This allows the bath heater to run together with a bath pump on a 15A 110 GFCI circuit.

This bath heater is normally meant for use on 1.5 inch plumbing, but can also be used on 1.0 inch plumbing when using the fittings that are provided. Inside diameter is approximately 2.375 inch for the black heater split nuts.

SpaGuts P/N: 25-150-0014


  • Stainless Steel 7.0" x 1.5" in-line heater
  • 650W 110V Incoloy heater element
  • Built-in Vacuum Switch to activate heating
  • Automatic smart thermostat (104 degrees F limit)
  • Reversible mounting
  • Heater on light
  • Hi-limit protection
  • 1.5" and 1.0" pipe fittings included
  • Pair of 1.5" Heater O-Ring Gaskets included
  • 110V 60Hz 3ft NEMA cord with Piggy Back Style Plug
  • Copper Bonding Wire included
  • Installation and Operation Manual
  • 2-year limited warranty
  • UL Recognized for safety standards


*NOTE that dimensions are approximate.

Vacuum: This bath heater is meant for installation on the suction side of your bathtub pump, which has a built-in vacuum switch. If you need this same style bathtub heater to be installed on the pressure side of your bathtub pump, see link to the Pressure Switch Version.


The Vacuum Switch model bath heater is also a replacement option for the following model numbers: SG101-65UV, C3J93P1-E01EJUZ, PH101-65UV, CT100

This bath heater is also a replacement option for the following brand bath heaters: American Standard, Safe-T-Heater, Hydro-Quip Compact Series Whirlpool Bath Heater, Jacuzzi RapidHeat, Pure Heat, Elger, Menards

The use of a SpaGuts brand bath heater helps to eliminate the rapid cooling that occurs during the operation of your whirlpool bath, providing you a continuous source of hot water and extending the pleasure of your jetted bath experience. This bath heater is normally for use in jetted bathtubs up to 70 gallons. For more information, please see Installation Instructions in the installation tab above. For larger bathtubs and specific heater size requirements, refer to your jetted bathtub manufacturer for their recommendation.

NOTE: This bath heater is designed to maintain the current bath water temperature in the tub, and is not meant to heat water from cold to hot.