Routine Cleaning :
Where buildings cannot be retrofitted, periodical raising of temperatures to at least 70oC, or chlorinating and flushing should be considered. Systems should be inspected annually to ensure thermostats are not malfunctioning.
Where the system is required to be in continuous operation, appropriate stand-by equipment should be provided to facilitate regular maintenance.
Materials used for components in contact with water, e.g. O-rings, gland packings, gaskets, washers and lubricants should be compatible with each other and not foster microbial growth or react adversely with treatment chemicals.
The hot water tanks should have close fitting covers to prevent foreign matter entering into the water.
Hot water systems should be designed to heat the water to or above 60oC and calorifiers should be designed and installed so as to prevent stratification of temperature and collection of sludge.