This part is a 5.5KW Sundance Sentry 850 / 750 Smart Heater Complete Assembly includes the Body, Element, Case and Manual Bimetallic Hi Limit with wires. This unit features a BiMetallic Backup high limit and the wires that tie to the board and is exactly like the original equipment.  Note: When testing this heater if it trips the breaker simply unplug it and if the breaker stays on plug back in and if it trips this heater is the cause if it is not a breaker trip issue then measure between the two terminals with an Ohm meter it should measure about 10.5K ohms. If it measures 0K it is open. If it is not tripping the breaker and doesn't measure open then the heater is not bad look for other issues that cause no heat Like a Flow Switch, Stopped up filter, No water movement, Bad Circulation Pump, Open circuit on board etc…..  Used On:
All 2005+ Sundance 800-850 Models for USA/Canada 60HZ
All 2000-2004 Sundance 850/Portofino
Models for USA/Canada 60HZ

Replacement Option For:
AI #2-00-0158 / MFG #E2550-3314
AI #SD6500-301 / MFG #6500-301

IMPORTANT NOTE: This Smart Heater has a slightly smaller dry well. When installing these heaters into spas manufactured prior to April 2007, you can no longer use the OEM Hi-Limit Sensor since it is too large to fit into the new heater's sensor well. You will need to replace both the Smart Heater and Hi-Limit Sensor (Click Here for This Part) as a set.