When you opened the hot water faucet, it immediately filled with hot water after a few seconds. In the toilets, there were bigger, often gas-powered units that did the same thing. There would be no tank and no constantly boiling water, and the quality would be almost the same. Efficiencies of more than 80% were normal. The overall performance would be much higher because there would be no water storage tank and its associated standby heat loss. Unlike a storage tank WH, which heats the water twice and keeps it hot, a tankless WH heats the water only once for immediate use, resulting in higher efficiency. This is true for both electric and gas tankless water heaters. Read this Sav-On Plumbing – Sun City – Sun City Water Heater
Later on, as technology progressed, the whole-house tankless WH, or on-demand WH as it is also known, became available. The idea is to only provide hot water to the entire house when it is needed. A large volume of water will be heated as needed, whether for a shower, the kitchen, or the washing machine all at once. Worries over cold running showers were no longer a problem. You can now fill up the bath tub without worrying about running out of hot water.
As long as there is water and gas or electricity to heat the water on the go, the best tankless WH offers constant hot water. There’s no storage tank, so there’s no running out of hot water, and it’s all done at an impressive 80 percent quality. Noritz, a pioneer of tankless technology, has unveiled the Noritz 842 tankless WH. With tankless technology, it achieves an incredible performance of nearly 94 percent. Its exhaust venting is made of PVC, so it wastes almost no energy and therefore does not need to be vented. If you were to ask who makes the best Tankless WH, Noritz will be at the top of the list as the world’s largest tankless WH manufacturer.