{"id":451,"date":"2021-04-17T09:48:36","date_gmt":"2021-04-17T09:48:36","guid":{"rendered":"https:\/\/knowall.dev19.bigideas.io\/?post_type=ht_kb&#038;p=451"},"modified":"2022-04-06T00:02:04","modified_gmt":"2022-04-06T00:02:04","slug":"low-pressure","status":"publish","type":"ht_kb","link":"https:\/\/help.noritz.com\/index.php\/knowledge-base\/low-pressure\/","title":{"rendered":"Why do I get very little pressure at my fixtures when I turn on the hot water?"},"content":{"rendered":"\n<p>Low hot water pressure issues can stem from the source of hot water or localized at the faucet. If certain fixtures exhibit low hot water pressure while other fixtures don&#8217;t appear to have the same problem, the issue is most likely at those fixtures. Most commonly scale build up in the aerator or the shower head.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"857\" height=\"568\" src=\"https:\/\/help.noritz.com\/wp-content\/uploads\/2022\/02\/faucet_scale.png\" alt=\"\" class=\"wp-image-569\" srcset=\"https:\/\/help.noritz.com\/wp-content\/uploads\/2022\/02\/faucet_scale.png 857w, https:\/\/help.noritz.com\/wp-content\/uploads\/2022\/02\/faucet_scale-300x199.png 300w, https:\/\/help.noritz.com\/wp-content\/uploads\/2022\/02\/faucet_scale-768x509.png 768w, https:\/\/help.noritz.com\/wp-content\/uploads\/2022\/02\/faucet_scale-50x33.png 50w, https:\/\/help.noritz.com\/wp-content\/uploads\/2022\/02\/faucet_scale-60x40.png 60w, https:\/\/help.noritz.com\/wp-content\/uploads\/2022\/02\/faucet_scale-100x66.png 100w\" sizes=\"auto, (max-width: 857px) 100vw, 857px\" \/><figcaption>Excessive scale build up on the aerator.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"806\" height=\"519\" src=\"https:\/\/help.noritz.com\/wp-content\/uploads\/2022\/02\/shower_scale.png\" alt=\"\" class=\"wp-image-570\" srcset=\"https:\/\/help.noritz.com\/wp-content\/uploads\/2022\/02\/shower_scale.png 806w, https:\/\/help.noritz.com\/wp-content\/uploads\/2022\/02\/shower_scale-300x193.png 300w, https:\/\/help.noritz.com\/wp-content\/uploads\/2022\/02\/shower_scale-768x495.png 768w, https:\/\/help.noritz.com\/wp-content\/uploads\/2022\/02\/shower_scale-50x32.png 50w, https:\/\/help.noritz.com\/wp-content\/uploads\/2022\/02\/shower_scale-60x39.png 60w, https:\/\/help.noritz.com\/wp-content\/uploads\/2022\/02\/shower_scale-100x64.png 100w\" sizes=\"auto, (max-width: 806px) 100vw, 806px\" \/><figcaption>Scale build up on a shower head.<\/figcaption><\/figure>\n\n\n\n<p>You may use vinegar or a calcium lime rust remover to clean up scale deposits and restore flow.<\/p>\n\n\n\n<p>If all hot water fixtures in the house appear to have low hot water pressure, more than likely the restriction is at the source of hot water. Our tankless water heaters have an inlet screen filter to catch debris and prevent it from getting into the unit. Over time depending on water quality and other factors build up may accumulate in the filter and it needs to be cleaned. In most cases cleaning the inlet filter is something the homeowner can do themselves. The following video will give a basic idea of the process.<\/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=\"Noritz Quick Tech Tip\" width=\"643\" height=\"362\" src=\"https:\/\/www.youtube.com\/embed\/8bSSNkynZI4?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><\/p>\n\n\n\n<p>If you have had low hot water pressure from the day your tankless was installed, it could be that the incorrect size tankless unit was installed for your application. Tankless water heaters are installed based upon the <strong>peak demand<\/strong><sup>2<\/sup> in an application. Also you will get less hot water flow in the winter than in the summer, due to the reduced inlet water temperature. When sizing a tankless water heater use the worst case <strong>temperature rise<sup>1<\/sup> <\/strong>for your region along with peak demand.<\/p>\n\n\n\n<p><strong>A local Noritz service representative can be located on our <a rel=\"noreferrer noopener\" href=\"https:\/\/contractorfinder.noritz.com\/contractors?installer=false&amp;servicer=true\" target=\"_blank\">Contractor Locator<\/a>.<\/strong><\/p>\n\n\n\n<p><strong>Temperature Rise<\/strong>1<br>The difference between the set temperature of the tankless heater and the ground water temperature (e.g. 120 Fahrenheit setting &#8211; 60 Fahrenheit ground water = 60 degree Fahrenheit rise.)<\/p>\n\n\n\n<p><strong>peak demand<\/strong><sup>2<\/sup><br>the largest gallon per minute flow rate experienced by a plumbing system during normal operation<\/p>\n\n\n\n<p>Applicable Models<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Models:<\/strong> ALL MODELS<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Low hot water pressure issues can stem from the source of hot water or localized at the faucet. If certain fixtures exhibit low hot water pressure while other fixtures don&#8217;t appear to have the same problem, the issue is most likely at those fixtures. Most commonly scale build up in&#8230;<\/p>\n","protected":false},"author":1,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[5],"ht-kb-tag":[21],"class_list":["post-451","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-general-questions","ht_kb_tag-general"],"_links":{"self":[{"href":"https:\/\/help.noritz.com\/index.php\/wp-json\/wp\/v2\/ht-kb\/451","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=451"}],"version-history":[{"count":5,"href":"https:\/\/help.noritz.com\/index.php\/wp-json\/wp\/v2\/ht-kb\/451\/revisions"}],"predecessor-version":[{"id":891,"href":"https:\/\/help.noritz.com\/index.php\/wp-json\/wp\/v2\/ht-kb\/451\/revisions\/891"}],"wp:attachment":[{"href":"https:\/\/help.noritz.com\/index.php\/wp-json\/wp\/v2\/media?parent=451"}],"wp:term":[{"taxonomy":"ht_kb_category","embeddable":true,"href":"https:\/\/help.noritz.com\/index.php\/wp-json\/wp\/v2\/ht-kb-category?post=451"},{"taxonomy":"ht_kb_tag","embeddable":true,"href":"https:\/\/help.noritz.com\/index.php\/wp-json\/wp\/v2\/ht-kb-tag?post=451"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}