With the increased efficiency of solar vacuum tubes, heating hot tubs has become more and more popular using solar.  The basic principle of a solar hot tub is to use the solar collectors during the day to heat the tub.  In the evening you may find you will still need and auxilliary heater.  We always recommend using keeping your exisiting heater and runnning the solar on a secondary loop (see system A)

If you are are in a warmer climate or using your hot tub in non freezing conditions, then you can run an open vaccum tube system such as the TZ58-1800-40G Pool collector to heat the hot tub.  This type of system heats the hot tub water directly.  It is best used with our solar PV panel and a solar cirulating pump such as the Laing DC-5.

If you intend to heat your hot tub durring freezing conditions via solar then you would need a system that uses heat pipe collectors with antifreeze mixture and a heat exchanger that integrates with the existing hot tub circulation system.  For the solar loop a DC pump and PV panel can also be used. Alternatively the hot tub could be used as a secondary zone for domestic hot water heating.  In this way the SDS (Solar Distribution System) will controll the heat of the hot tub as well as hot water.  A dual zone system allows for maximum use of solar year round!

Solar Hot Tub Configurations
Non-Freeze	Freeze	Double Zone