The temperature must be higher than 50ºC.
The minimum temperature of the domestic hot water supply must be higher than 50ºC for sanitary reasons but also for utility reasons, namely for cleaning and washing tasks.
As torneiras são misturadoras precisamente para que o utilizador possa usar água quente, temperada ou fria. Países como a França e a Alemanha definem a temperatura mínima de fornecimento nos 55ºC.
Comparison of energy consumption for different temperatures in the water heater.
Consider an installation with a water heater and a shower head with a flow rate of 9 l/min with a bath temperature of 38°C. Note that the shower flow rate is a characteristic of the mixer and the shower head used.
Situation A – the bath flow rate is the sum of 6.5L/min of hot water and 2.5L/min of cold water.
Situation B – the bath flow rate is the sum of 4.6L/min of hot water and 4.4L/min of cold water.
In situation A, the heater will heat a flow rate of 6.5L/min from 20ºC to 45ºC, consuming about 0.27KWh.
In situation B, the heater will heat a flow rate of 4.6L/min from 20ºC to 55ºC consuming the same amount of gas, about 0.27KWh.
Conclusion:
Increasing the temperature of the water heater (>50°C) is recommended and does not represent additional gas consumption.
← RETURN TO THE HOME PAGE
