Conventional tank water heaters are still the most popular type of water heaters for residential use. Water is heated in a tank by natural gas or propane(LP) burners, or by electric heating elements. Water is constantly heated in the tank and this can result in standby heat loss. Tanks vary in size, up to 80 gl for a single family home. Proper sizing is very important and will reduce the loss of energy or the risk of running out of hot water in the middle of a shower. Pacific Tankless offers free onsite consultations and estimates, fast and professional installations, and extremely competitive pricing.