Running a shower on hot water from a combi.
When another hot water tap is turned the hot water supply to the shower is reduced in flow and/or temperature.
The reaction time of a thermostatically controlled shower mixer to this reduction in the hot water supply has to be fast enough to prevent a drastic drop in temperature of the water coming out of the shower head.
The sudden change from hot shower to colder shower is at best not comfortable, at worst it can result in a fall as the person tries to get away from the cold water..(*)
When the hot tap is turned off and the shower once again has hot water then the time taken for the shower thermostatic valve to react can be long enough for the un-expected hot water to scald the person in the shower before the thermostat adjusts the temperature to a safe level.
(*) The "cold shock" affects both heart rate and breathing, in extreme cases this can lead to a heart attack.
When another hot water tap is turned the hot water supply to the shower is reduced in flow and/or temperature.
The reaction time of a thermostatically controlled shower mixer to this reduction in the hot water supply has to be fast enough to prevent a drastic drop in temperature of the water coming out of the shower head.
The sudden change from hot shower to colder shower is at best not comfortable, at worst it can result in a fall as the person tries to get away from the cold water..(*)
When the hot tap is turned off and the shower once again has hot water then the time taken for the shower thermostatic valve to react can be long enough for the un-expected hot water to scald the person in the shower before the thermostat adjusts the temperature to a safe level.
(*) The "cold shock" affects both heart rate and breathing, in extreme cases this can lead to a heart attack.