Sigmar Marine's COMPACT is an innovative Series of water heaters from 20 to 40 litres, cased in a new sturdy compact Plastic shell with integrated mounting brackets and an 800W-heating element. These water heaters offer the following advantages: Better thermal insulation: more insulation material covers the upper part of water heater where heat Dissipation is normally greater thanks to inside tank's dis-axial position. Quicker and simpler installation: no separate mounting brackets to be dismantled/remounted. Integrated bracket's occupy less space than equivalent cylindrical models with separate fastening brackets.