What kw Heat Pump do I need for my spa? Sherralyn Hawkins November 07, 2017 21:30 Follow As a general rule, the 5.5kw Spa Heat Pump works well on spas up to 3000 Litres and 8kw works well on spas/swim spas up to 5000 Litres. For assistance, please contact one of our team. Related articles What is the difference between the Hybrid Heat pump standard & the Power Save option for the SpaNet XS Heat Pump? Comments 0 comments Article is closed for comments.