Leave the task to the professional. Thank you for your excellent work helping me pick out the parts for our new bathrooms you are so organized and had all of the workmen there on time. Quickly heat up 14 litres of water in electric mode and keep the water hot for an especially long time. Need some friendly advice? call our team today to find out more on. A back boiler is installed in the recess behind a fireplace and serves to provide heating and hot water it is a traditional method of producing.