Recently a discussion has begun to emerge within the Building Services sector questioning the high level of temperature being maintained within domestic hot water systems, in order to reduce risks from legionellosis.
Standardly in the UK and governed by the Approved Code of Practice L8 4th Edition and accompanying HSG 274 technical guidance, the hot water is stored at 60ᶛC and delivered to the outlet at 50ᶛC. The L8 also refers to the avoidance of temperatures between 20ᶛC – 45ᶛC.
In Denmark the recommended temperature for storage is 53ᶛC and in Holland 57ᶛC.
Higher temperatures will increase energy inefficiency, in allowing build-up of lime-scale and greater heat loss from pipe-work surfaces and other factors.
Furthermore, the higher the operating temperature the higher the risk of scalding.
This is a debate that will no doubt continue but for now, the standards will no doubt continue to mirror those indicated within HSE ACOP L8.
Water Hygiene & Legionella Control
We provide a full range of services, from professional technical surveying for Legionella Risk Assessment obligations, through to demanding water tank refurbishment, system disinfections and installation of Chlorine Dioxide systems. All aimed at ensuring safe, clean water.