Ash shovel & wooden paddle. Plastic & Spruce OVAL. – hot tub cover;. Wooden parts (basic-spruce) – nice round wooden edge on top. - Wooden parts painting - extra £140;. Bottom water outlet;. Needs approx.700-800 liters of water and in just 2.5 – 3 hours to heat up… depending on how good your fire building skills are and how hot water you like!