St Edmund’s School Canterbury is an independent coeducational day and boarding school for pupils aged three to eighteen, offering the opportunity for an integrated educational experience beginning in the Pre-Prep School, through the Junior School and into the Senior School on the same campus and, where appropriate, sharing the same facilities. There are 200 girls and 350 boys across the school, of which approximately 18% are boarders.
The school originated in 1751 but has been on its present site since 1855. The buildings have evolved and changed as required by the school’s development, but some have stood for many years. There are four main plant rooms with systems using both gas and oil for heating and domestic water. Over time, hard water has caused scale to build up in the hot water systems
resulting in very poor temperature recovery leading to frequent complaints about lack of hot water, particularly in winter.
Hearing about ETC
’s ability to both halt and actually reverse the effects of scaling, School Bursar, Mary Stannard, contacted the company seeking a solution. An ETC
applications engineer carried out a site survey with maintenance manager, Robin Fishwick, to identify the problem areas and decide where Scalewatcher E NiGMA would be most effective in treating the various systems
Temperature data loggers were located at the girls’ dorm installation so that a comparison could be made between old and new cylinders. The results showed that the cylinders were recovering temperature much more rapidly, even in winter. The older cylinders achieved an increased temperature of 5oC within six months, matching the temperatures of the newer cylinders. Most importantly, there have not been any further complaints from the pupils with regard to lack of hot water.
In addition, the heat exchangers in the mixed dorm are recovering temperature 60% faster and the maintenance manager is considering switching off the primary during the day, which would reduce the considerable oil consumption.
Records kept by the ETC
engineer concluded that within six months of installation the two older heat exchangers recovered their heat within 3 hours as opposed to 12 previously and gas consumption has been reduced by at least 25%.
The descaler installed to treat water for the showers in the boys’ dorm had a positive result as the showerheads now require only annual descaling as opposed to a necessary termly descale. The effectiveness of the Scale watcher E NiGMA units can also be seen in the laundry where the water softeners to the hot water system have been disconnected with no appreciable problems and consequential savings in salt and re-gen water.