WHALE Gas & Electric Storage Water Heater. The Whale High Capacity 13L Water Heater gives you more hot water for longer with the flexibility of versatile gas and or electric running options.Easy to use control panel with choice of settings. Lighweight unit weighs only 10kg (dry weight). Robust insulation retains heat for longer. New flue design, no cover required. New pressure relief valve with drain function, drains entire water system faster. Easy installation. 3 year warranty. Complete with retro fit kit for replacement of Caraver Cascade Water Heater. PLEASE NOTE: All Whale Water Heaters must be installed and serviced by a fully qualified gas engineer in accordance with the appropriate installation instructions. Complete with retro fit kit for replacement of Caraver Cascade Water Heater.