LX H20-RS1 Heater with Thermoregulator 2KW. Required flow rate: Set by pressure switch, this switch will need to be pressurised, if it runs straight to a big bore out let with no bends, there will be no back pressure and it may not work.
eBay
1pc Premium 420D Inflatable Hot Tub Heater Pump Cover - Fits Most Spa Models, Durable & Weather-Resistant (Grey/Black, Square)
Aliexpress UK
Hi and welcome to my sale of my hot tub pump and control unit As you can see from the pictures I have 2 hot tubs both of them are lazy spar I bought the square one with no pump So I set about finding a pump for it . Mistakenly, I was told that lazy spr and Intex would interchange wrong fittings are all the wrong way around etc So it’s now up for sale I am asking £125ono £125 would be still less than I paid for it  With the pump I will throw it spare round pool cover with inflatable insulation pad if you want them If you have any questions please let me know I would prefer pick up only, but if you want me to post it, we can sort something out with the carriage thanks Graham 
eBay
Tub Spa Heater Pump Cover Waterproof Hot Tub Pump Cover with Zipper All Weather Protection Hot Bathtub Pump Cover for Tub Spa
Aliexpress UK
Product Feature: . Application: This heater is suitable for Balboa BP Series control systems, such as BP501G1, BP501G3, BP2000G1, BP7, as well as for Balboa VS Series and EL2001 Series control systems, such as VS501Z, VS510SZ, VS520SZ, and EL2001M3. . Multiple Model Replacements: It can replace multiple models, including 2-00-7028, 58306, 58306KIT, 58083, 58083K, 26-58083-7S-KS, 26-0807-7S-KS, 2-00-0036C, C2550-0807-TPS, 58209, 58000, 58010, 58123, 58089, 58086, 58105, or X300930, 46-138-1020, 58016, 55473, 58140, 740-0617, 740-0655, 2-00-0049, 55624 Master Spas X300713, 58016, 25-250-0807, 25-200-8083, 26-58083-K, Artesia OP24-0216-08, 25-200-0001, 58237 (5.5KW 825 15IN 1.5 inch), 25-175-1010, and others. .
eBay
Hot Tub Spa Heater PumpCoverInflatable Hot Tub PumpCoverSuitable for Most Hot Tub SpaHeater Pump on Market （only cover）
Aliexpress UK
The Intex PureSpa Hot Tub Pump and Control Unit SB-H20 is a round inflatable hot tub with a sleek grey colour and a seating capacity of 4-5 people. Made by the brand Intex, this hot tub features an air system jet type and includes a pump in the set. With a heater feature and a plastic frame material, this unit is designed for easy maintenance and durability. The pump operates on 220-240V and has a cord length of 5m, making it a convenient and stylish addition to any outdoor space. It’s only been used for summers of 23 and 24.
eBay
Hot Tub Spa Heater PumpCoverInflatable Hot Tub PumpCoverSuitable for Most Hot Tub SpaHeater Pump on Market （only cover）
Aliexpress UK
LX H30-RS1 Heater with Thermoregulator 3KW. Required flow rate: Set by the pressure switch, this switch will need to be pressurised, if it runs straight to a big bore out let with no bends, there will be no back pressure and it may not work.
eBay
Universal Inflatable Spa Water Heater Pump Cover For Hot Tub Spa Heater Pump Waterproof Hot Tub Pump Cover Outdoor Pool Parts
Aliexpress UK
Compatible with: Chinese spas where you may require a plumbing change or as a remote heater on a project.
eBay
3KW 220V Heater SPA Electric Water Heater Pump Bathtub Pool Hot Tub Equipment Water Heater Thermostat
Aliexpress UK
The Bestway Lay-z Hot Tub Pump/Inflator is a round plastic heater designed for use with Lay-Z-Spa hot tubs. This set includes a pump to help inflate and heat the water, making it an essential accessory for enjoying a relaxing spa experience in your garden or patio. The Freezeshield feature ensures that the water remains at a comfortable temperature even in colder weather, making it a practical and convenient addition to your outdoor leisure time.
eBay
Universal Inflatable Spa Water Heater Pump Cover For Hot Tub Spa Heater Pump Waterproof Hot Tub Pump Cover Outdoor Pool Parts
Aliexpress UK
This is a high-end spa with plenty of life left once sorted. This is a spacious, powerful spa that needs a little TLC to get back to full working order. • Tub powers up and was last working before being drained.
eBay
Hot Tub Heating Element Spa 2.8KW Balboa Heater
Aliexpress UK