If your home is served by a traditional water heating tank, you’re pouring energy into heating water 24 hours a day, whether you need hot water or not. What a waste! If it’s almost time for you to replace your current hot water heater (before it does something dramatic like spring a leak), consider switching to a tankless hot water system.
Tankless water heaters wait until you turn on the tap to begin heater hot water, and it may take up to 15 seconds before you reach the temperature you desire, but is that really much longer than your current system?
You can save 27 to 50% of your water heating costs by switching to a tankless heater.
Interested? Check out this great guide from This Old House.
https://www.thisoldhouse.com/plumbing/21019184/read-this-before-you-buy-a-tankless-water-heater
Sustainable Ewing Green Team 
The tankless water heater is efficient and fast. The one major problem is that due to the instant demand for hot water, the volumetric flow rate of natural gas required to produce this is very high! This high flow of gas is used in all home is a community significantly lowers the gas pressure and the flow rate as the gas pipes were not sized for this massive flow rate. This is mostly a problem on weekends and at night when all families are home using hot water.
LikeLiked by 1 person