How can I be sure there will be enough flow of hot water from a combi boiler to operate one of your shower towers?
The performance of a combi-boiler is determined by its kW rating, the ambient temperature of the cold water entering the boiler and the setting of the domestic hot water thermostat on the boiler. The boiler specification literature should provide flow rate figures for a given temperature rise, enabling hot water output throughout the year to be established. As a rough guide to requirements each function on a shower tower i.e. the overhead spray, hand held spray and body jets can each deliver from 8 to 14 litres per minute, depending on supply pressure. To satisfy two functions simultaneously effectively requires around 13 litres per minute therefore the flow of hot water from the combi boiler at a minimum temperature of 52°C needs to be in the region of 10 to 12 litres per minute to satisfy a shower tower all year round.
