The Balboa VS501 Spa Pack is considered as the most popular and universal retrofit spa pack and will operate well with every make and model of hot tub. This spa pack is able to operate primary jet pump of one speed or two speeds and a secondary pump, which can be a circulation pump, a blower or a second jet pump.
The Balboa VS501 spa pack features the patented M7 technology that means the direction of flow is not necessary. This spa pack can be mounted upside down and will work perfectly. Unlike other spa packs available, it has no pressure switch or hi-limit switch, which causes failure in spa heater often.
Instead this Balboa spa pack utilizes two temperature sensors before and after the heating element to detect the temperature and flow. This patented M7 technology eliminates the requirements of pressure sensors and remote heat sensors that are common on other older spa packs.
Read More- https://balboavs501.blogspot.com/2019/09/understanding-balboa-vs501-spa-pack.html
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