As heat interface units are an inherently low maintenance space heating system, the recommendation from BSRIA BG 62/2015 is that a maintenance check every 3 years should be sufficient.
However, we recommend that HIU strainers are checked at least once annually, depending on the water quality of the installation.
Any build-up of debris can cause flow restriction and when left unchecked, damage to components within the HIU.
BSRIA inspection and maintenance procedure guidance recommends the following checks are carried out ever 3 years:
- No leaks associated with Heat Interface Unit or secondary distribution
- Primary isolation valves are operable
- Internal strainers are clear
- Supply differential above required minimum
- Thermal insulation is intact
- Control valves respond to demand signals for heating and hot water
- Supply temperatures to heating and hot water are as when the unit was commissioned
- Check mains pressure storage water heater safety valve (where fitted)
- Heat meter registers demand (or replace and commission new heat meter if scheduled)
- Consumer is satisfied with heating and hot water performance
Want to know more about HIUs or heat networks? We’ve compiled some FAQs to cover the most common questions.
