Water Heaters

It is important to maintain the temperature nutrient solution between 20-24°C as this will ensure better growth rates and is particularly important during the colder season

With water heaters they are only to be used in environments that are very cold. You are not meant to heat the water just remove the chill from it. The water would still seem colder than it would hotter. Feeding your plants warm water is more detrimental than feeding them cold water.