SOLARE came with a new QL Water heater installed by the PO. I'm quite impressed with it as it provides almost instant hot water on shore power (15 minutes or less) and it keeps the water hot for well over a day.
The QL water heater is available in 20, 22, 30, 40 and 60 L (5–16 gallons) sizes. The tank is made completely in acid resistant stainless steel, which makes it very suitable for the marine environment. The design and materials also meet the highest sanitary requirements. The QL water heaters are insulated using polyurethane foam, a material that contains a lot of air and thus reduces heat dissipation. The insulation is extra thick on the upper panel and helps keep the water hot long after it has been heated. Thanks to the QL water heaters innovative compact plastic casing and integrated brackets these units occupy less space than equivalent cylindrical models with separate fastening brackets. They also feature greater security, like five sturdy fixing points with no sharp edges.
QL is using electric heating elements in incoloy which have a much longer life compared to copper and have the great advantage of not being damaged if switched on electrically without any water in the tank.