Part number 28-E0300-5T-K is a Hydro Quip Low Flow Vertical 4.0kW 230V Titanium Heater Assembly designed as a replacement for several spa brands, primarily those that use a 24-hour circulation pump.
The following hot tub manufacturers and brands have used this specific heater or compatible components in their spas:
Gatsby Spas: This is the primary brand for which this specific replacement heater was designed.
Blue Ridge Spas: Utilizes this 4kW low-flow vertical heater assembly in their models.
Coleman Spas: Certain models under the MAAX/Coleman umbrella are compatible with this heater.
Maax Spas: As the parent company of Coleman, several of their manufactured spas use this low-flow heater design.
Sundance Spas: This part is used in specific Sundance spa models.
Leisure Bay: Compatible with Leisure Bay spa systems.
Dynasty Spas: Another manufacturer that uses this type of Hydro Quip low-flow heating system.
Jacuzzi Whirlpool: Compatible with certain Jacuzzi brand spa heaters.
This specific heater is a titanium upgraded version of the original OEM parts, offering increased corrosion resistance.
These product listings detail compatible spa brands and specifications for the 28-E0300-5T-K low-flow titanium heater assembly: