There are mainly two reasons: the temperature sensitivity of the manual thermostat is not sensitive, resulting in delay, the hot pressure inside the hot bladder rises sharply, and the gas and water are shot out from the exhaust hole together. Solution: You can choose a thermostat with a smaller temperature control coefficient, and also reduce the aperture of the exhaust hole.
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In addition, the hot bladder heat pipe catamite causes the hot gas pressure to be too large solution: the hot bladder can be replaced.