{"id":10676,"date":"2026-03-16T15:09:35","date_gmt":"2026-03-16T13:09:35","guid":{"rendered":"https:\/\/zesta.gr\/blog\/how-do-tankless-water-heaters-work\/"},"modified":"2026-07-30T14:06:26","modified_gmt":"2026-07-30T11:06:26","slug":"how-do-tankless-water-heaters-work","status":"publish","type":"blog","link":"https:\/\/zesta.gr\/en\/blog\/how-do-tankless-water-heaters-work\/","title":{"rendered":"How do tankless water heaters work?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Created on: <\/strong>2020-04-01<\/p>\n\n<p class=\"wp-block-paragraph\"><sup>How they work and the best applications for their use. <\/sup><\/p>\n<div class=\"wp-block-image\">\n<figure class=\"alignright\"><img decoding=\"async\" src=\"https:\/\/zesta.gr\/image\/catalog\/Blogs\/tahithermantires.jpg\" alt=\"\"\/><\/figure>\n<\/div>\n<p class=\"wp-block-paragraph\"><sup><strong>What is <\/strong>a Tankless Water Heater: Tankless water heaters are modern electric appliances designed to provide domestic hot water on demand. They heat water instantly \u2014 only when it\u2019s needed and only in the amount required. This ensures immediate hot water, while saving both energy and water. Next-generation models feature a heat exchanger with advanced heating elements that resist limescale buildup, ensuring long-lasting, reliable operation. Unlike traditional or solar water heaters, tankless units don\u2019t include a storage tank, so no energy is wasted keeping unused water hot. Modern digital (inverter) models automatically adjust their power output to deliver water at the exact temperature you\u2019ve selected. In addition to electric units, gas-powered tankless water heaters are also available.      <\/sup><\/p>\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-8f761849 wp-block-group-is-layout-flex\">\n<p class=\"wp-block-paragraph\"><sup><strong>How do tankless water heaters work:<\/strong> When you turn on the tap, cold water begins to flow into the tankless water heater. A built-in flow sensor automatically activates the heating element within the heat exchanger, instantly warming the water. This means you get hot water within seconds \u2014 and as long as the tap remains open, the unit continues to heat the water. Unlike traditional or solar water heaters, the hot water supply never runs out. The higher the power rating of the unit, the faster it can heat the water and the greater the flow rate it can deliver at your selected temperature. For this reason, it\u2019s a good idea to review the unit\u2019s performance chart before purchasing \u2014 it shows how flow rate varies depending on power level and inlet water temperature, helping you choose the model that best meets your needs. If the tankless water heater is self-regulating (digital inverter), it automatically adjusts its power output to maintain the desired temperature, providing additional energy savings. Such units can also be installed in series with other hot water systems, such as solar heaters or central heating boilers. In this setup, the tankless heater activates only when the incoming water temperature is below the desired level, consuming just the extra energy required to reach the set temperature. Modern tankless water heaters are rated energy efficiency class A. All certified models also feature multiple safety protections, including thermal cut-off and electric shock protection devices, ensuring completely safe operation.<\/sup><\/p>\n<\/div>\n<div class=\"wp-block-image\">\n<figure class=\"alignright is-resized\"><img decoding=\"async\" src=\"https:\/\/zesta.gr\/image\/catalog\/Blogs\/litourgia-taxithermantira.jpg\" alt=\"\" style=\"aspect-ratio:1.2339551905739534;width:289px;height:auto\"\/><\/figure>\n<\/div>\n<p class=\"wp-block-paragraph\">Where to use a tankless water heater: Tankless water heaters are suitable for both home and commercial use. They are most commonly installed to supply hot water in a home\u2019s bathroom or kitchen. However, they can also serve a wide range of professional spaces \u2014 from guesthouses, restaurants, and caf\u00e9s to hair salons (wash stations), gyms, butcher shops, construction sites, and student residences.<\/p>\n\n<p class=\"wp-block-paragraph\">Discover our range of digital<a href=\"https:\/\/zesta.gr\/product-category\/tahythermanthres\/tahythermanthres-inverter\/\" target=\"_blank\" rel=\"noreferrer noopener\"> inverter tankless water heaters.<\/a><\/p>\n","protected":false},"featured_media":10675,"parent":0,"template":"","meta":{"_acf_changed":false},"categories":[6654,6653],"class_list":["post-10676","blog","type-blog","status-publish","has-post-thumbnail","hentry","category-articles-blog","category-frequently-asked-questions"],"acf":[],"_links":{"self":[{"href":"https:\/\/zesta.gr\/en\/wp-json\/wp\/v2\/blog\/10676","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zesta.gr\/en\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/zesta.gr\/en\/wp-json\/wp\/v2\/types\/blog"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/zesta.gr\/en\/wp-json\/wp\/v2\/media\/10675"}],"wp:attachment":[{"href":"https:\/\/zesta.gr\/en\/wp-json\/wp\/v2\/media?parent=10676"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zesta.gr\/en\/wp-json\/wp\/v2\/categories?post=10676"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}