What is Star rating & thermostat?
Heat-retention efficiency and temperature control.
Short answer
Look for thermal cut-out plus a separate safety valve.
Star rating & thermostat when buying a water heater (geyser)
Heat-retention efficiency and temperature control.
Why it matters: A 5-star geyser loses less standby heat; adjustable thermostat lets you cap at 55–60°C and save power.
Look for: Look for thermal cut-out plus a separate safety valve.
Full Water Heater (Geyser) buying guide