Measured Heat Loss of Water Storage

Building Regulations require all hot water storage vessels to be insulated. BS 1566 and BS 3198 allow maximum heat loss for factory applied insulation of 1 watt/per litre of hot water storage capacity under test conditions. Most modern cylinders should already comply with, or improve on this minimum performance requirement.

Hot water pipes and hot water tanks should be insulated to prevent heat loss as this will lead to lower fuel bills. By fitting a British Standard insulating jacket to your hot water cylinder you could cut heat loss through this by 75%. If you have fitted one in the past you should check that it is at least 3” thick and replace if necessary. Most modern cylinders are produced with a fitted foam coating to provide maximum and thorough coverage. Each of the cylinder manufacturers generally produces a table of the measured heat loss from the different models and sizes of cylinder.

The measured heat loss used in SAP calculations is exactly that!

• Thermal Properties
• Thermal Mass
• Thermal Bridging
• Cylinders & Measured Heat Loss
• Dimensions
• Boilers & SEDBUK (Seasonal Efficiency Database of Boilers in the UK)
• Ventilation Systems & the Appendix Q database
• Solar Gains
• Insulation
• Space Heating Systems
• Water Heating Systems
• Low Carbon Power Souces
• Condensation & Dewpoint Analysis
• Heat Pumps