{"id":158,"date":"2021-04-13T08:02:56","date_gmt":"2021-04-13T08:02:56","guid":{"rendered":"https:\/\/knowall.dev19.bigideas.io\/?post_type=ht_kb&#038;p=158"},"modified":"2022-04-20T19:31:27","modified_gmt":"2022-04-20T19:31:27","slug":"descale","status":"publish","type":"ht_kb","link":"https:\/\/help.noritz.com\/index.php\/knowledge-base\/descale\/","title":{"rendered":"How do I descale\/flush the heat exchanger"},"content":{"rendered":"\n<p><strong>Descaling and flushing your tankless water heater for proper maintenance.<\/strong><\/p>\n\n\n\n<p>If you live in an area with hard water but do not have a water softening system or a Noritz anti-scale treatment device, you will need to descale the unit periodically based on the guidelines in the manual.<\/p>\n\n\n\n<p>In the owners and installation manual of your unit you will find charts similar to these below.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"420\" src=\"https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/04\/descale-1024x420.png\" alt=\"\" class=\"wp-image-159\" srcset=\"https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/04\/descale-1024x420.png 1024w, https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/04\/descale-300x123.png 300w, https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/04\/descale-768x315.png 768w, https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/04\/descale-50x21.png 50w, https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/04\/descale-1536x630.png 1536w, https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/04\/descale-60x25.png 60w, https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/04\/descale-100x41.png 100w, https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/04\/descale.png 1782w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"411\" src=\"https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/04\/Treatment02-1024x411.png\" alt=\"\" class=\"wp-image-160\" srcset=\"https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/04\/Treatment02-1024x411.png 1024w, https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/04\/Treatment02-300x121.png 300w, https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/04\/Treatment02-768x309.png 768w, https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/04\/Treatment02-50x20.png 50w, https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/04\/Treatment02-1536x617.png 1536w, https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/04\/Treatment02-60x24.png 60w, https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/04\/Treatment02-100x40.png 100w, https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/04\/Treatment02.png 1548w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Flushing or De-scaling is part of the regular maintenance of a Noritz heater. &nbsp;It involves circulating a solution of pure vinegar or Calcium, Lime, and Rust product through the heat exchanger using a submersible pump. &nbsp;You will need the following equipment to conduct a de-scale:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Bucket&nbsp;<\/li><li>Submersible pump&nbsp;<\/li><li>Isolator valve kit (installed on heater)&nbsp;<\/li><li>Water line connections (the isolator valves have a 3\/4&#8243; hose thread connections on their flush ports)<\/li><li>Descaling solution (vinegar or Calcium, Lime, Rust product)<\/li><\/ul>\n\n\n\n<p>For complete step by step instructions, please see the attached instruction manual.<\/p>\n\n\n\n<p>For units that start with the following names below, see attached file &#8220;Descale Procedure Group A Zone II\u201d.<\/p>\n\n\n\n<p>\u2022 NR501-OD<\/p>\n\n\n\n<p>\u2022 NR662-OD<\/p>\n\n\n\n<p>\u2022 NRC661A-OD<\/p>\n\n\n\n<p>\u2022 NRC661A-DV<\/p>\n\n\n\n<p>\u2022 NRC711-OD<\/p>\n\n\n\n<p>\u2022 NRC711-DV<\/p>\n\n\n\n<p>\u2022 NRC663-FSV (EZTR40)<\/p>\n\n\n\n<p>For units that start with the following names below, see attached file &#8220;Descale Procedure Group B Zone III\u201d.<\/p>\n\n\n\n<p>\u2022 (GQ-2457\u2026.)<\/p>\n\n\n\n<p>\u2022 (GQ-2857\u2026.)<\/p>\n\n\n\n<p>\u2022 (GQ-C2857\u2026)<\/p>\n\n\n\n<p>\u2022 (GQ-C3257\u2026)<\/p>\n\n\n\n<p>For units that start with the following names below, see attached file &#8220;Descale&nbsp;Procedure NRCB180 NRCB199\u201d.<\/p>\n\n\n\n<p>\u2022 NRCB199DV (GHQ-C3201WX-FF US)<\/p>\n\n\n\n<p>\u2022 NRCB180DV (GHQ-C2801WX-FF US)<\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link\" href=\"https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/07\/descale_procedure_nrcb180_nrcb199.pdf\"><strong>Descale Procedure for NRCB<\/strong><\/a><\/div>\n<\/div>\n\n\n\n<p>For all other units not listed above, see attached file &#8220;Descale Procedure Group C\u201d.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link\" href=\"https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/07\/descale_procedure_group_c_copy2.pdf\" rel=\"\"><strong>Descale Procedure Group C<\/strong><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link\" href=\"https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/07\/descale_procedure_group_a_zone_ii_copy1.pdf\" rel=\"\"><strong>Descale Procedure Group A Zone III<\/strong><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link\" href=\"https:\/\/help.noritz.com\/wp-content\/uploads\/2021\/07\/descale_procedure_group_b_zone_iii_copy3.pdf\" rel=\"\"><strong>Descale Procedure Group B Zone III<\/strong><\/a><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\"><\/div>\n\n\n\n<p><strong>For a general outline of how to descale, please check out this video:<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"How to Descale a Noritz Heater\" width=\"643\" height=\"362\" src=\"https:\/\/www.youtube.com\/embed\/Mqh2EDcy6r8?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p><strong>If your unit has a blue &#8220;Flush Connector&#8221; follow the steps in the video or in the owner manual of your unit:<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Updated Descale Procedure (Flush Connector Units)\" width=\"643\" height=\"362\" src=\"https:\/\/www.youtube.com\/embed\/hTbB-PJfCo4?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Descaling and flushing your tankless water heater for proper maintenance. If you live in an area with hard water but do not have a water softening system or a Noritz anti-scale treatment device, you will need to descale the unit periodically based on the guidelines in the manual. In the&#8230;<\/p>\n","protected":false},"author":1,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[2],"ht-kb-tag":[31],"class_list":["post-158","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-technical-tips","ht_kb_tag-technical"],"_links":{"self":[{"href":"https:\/\/help.noritz.com\/index.php\/wp-json\/wp\/v2\/ht-kb\/158","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/help.noritz.com\/index.php\/wp-json\/wp\/v2\/ht-kb"}],"about":[{"href":"https:\/\/help.noritz.com\/index.php\/wp-json\/wp\/v2\/types\/ht_kb"}],"author":[{"embeddable":true,"href":"https:\/\/help.noritz.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/help.noritz.com\/index.php\/wp-json\/wp\/v2\/comments?post=158"}],"version-history":[{"count":6,"href":"https:\/\/help.noritz.com\/index.php\/wp-json\/wp\/v2\/ht-kb\/158\/revisions"}],"predecessor-version":[{"id":902,"href":"https:\/\/help.noritz.com\/index.php\/wp-json\/wp\/v2\/ht-kb\/158\/revisions\/902"}],"wp:attachment":[{"href":"https:\/\/help.noritz.com\/index.php\/wp-json\/wp\/v2\/media?parent=158"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/help.noritz.com\/index.php\/wp-json\/wp\/v2\/ht-kb-category?post=158"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/help.noritz.com\/index.php\/wp-json\/wp\/v2\/ht-kb-tag?post=158"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}