{"product_id":"a-o-smith-signature-series-6-6-gpm-160000-btu-indoor-natural-gas-tankless-water-heater","title":"A.O. Smith Signature Series 6.6-GPM 160000-BTU Indoor Natural Gas Tankless Water Heater - GT15-240-NI","description":"\u003cp\u003e \u003c\/p\u003e\n\u003ch2 class=\"romance\"\u003eA.O. Smith Signature Series 6.6-GPM 160000-BTU Indoor Natural Gas Tankless Water Heater - GT15-240-NI\u003c\/h2\u003e\n\u003cdiv class=\"romance\"\u003eA. O. Smith's Signature Series Condensing Indoor Tankless Ultra-Low NOx Gas Water Heater uses up to 160,000 BTU\/h of natural gas to deliver a 6.6 gallons per minute flow rate (based on a 35°F rise) of continuous hot water for your home when sized appropriately. This makes it a good match for whole home applications. A. O. Smith Tankless Gas water heaters only heat water when needed, making them one of the most energy efficient ways to heat water. This super high efficiency condensing indoor model has a 0.94 Uniform Energy Factor (UEF) and can reduce your energy consumption and save money on your energy bills. Additionally, our Tankless Gas design can be easily wall-mounted indoors, saving you valuable storage space. This model may qualify for additional energy efficiency rebates and tax credits in your local area. See Lowe's Rebate Center for details. Not sure if this is the right water heater for you? Use our product selector tool to see if this model is the right fit for your hot water needs. Tankless gas water heaters have special installation requirements. Professional installation is required.\u003c\/div\u003e\n\u003cdiv class=\"specs\"\u003e\n\u003cul class=\"bullets\"\u003e\n\u003cli tabindex=\"0\"\u003e\n\u003cp\u003eEnjoy continuous hot water for up to 2 simultaneous showers and 3 sink when sized appropriately (sink and shower calculations are based on a 0.5 GPM faucet and a 2.5 GPM showerhead in the southern zone)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli tabindex=\"0\"\u003e\n\u003cp\u003eSave money and energy with our ENERGY STAR® qualified Ultra-Low NOx indoor model that operates at a 0.94 Uniform Energy Factor (UEF)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli tabindex=\"0\"\u003e\n\u003cp\u003eCompact, indoor wall-mounted design frees up valuable storage space\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli tabindex=\"0\"\u003e\n\u003cp\u003eUses 1\/2 inch gas line up to 10 feet or 3\/4 inch gas line for longer lengths\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli tabindex=\"0\"\u003e\n\u003cp\u003eEasy temperature adjustment and troubleshooting with integrated controls\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli tabindex=\"0\"\u003e\n\u003cp\u003eCopper primary heat exchanger and stainless steel secondary heat exchanger provide superior heat transfer and protection resulting in extended product life\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli tabindex=\"0\"\u003e\n\u003cp\u003eWorry free safety features include freeze, overheat, and surge protection as well as troubleshooting diagnostic codes\u003cbr\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003eWhat our Experts Think\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli data-section-id=\"6dexe\" data-start=\"27\" data-end=\"381\"\u003e\n\u003cp data-start=\"29\" data-end=\"381\"\u003e\u003cstrong data-start=\"29\" data-end=\"63\"\u003eTrusted Multi‑Stage Filtration\u003c\/strong\u003e – The \u003cstrong data-start=\"70\" data-end=\"152\"\u003eA.O. Smith 2‑Stage Carbon Block Under Sink Water Filtration System (AO‑US‑200)\u003c\/strong\u003e uses \u003cstrong data-start=\"158\" data-end=\"195\"\u003etwo Claryum® carbon block filters\u003c\/strong\u003e to reduce up to \u003cstrong data-start=\"212\" data-end=\"307\" data-is-only-node=\"\"\u003e99 % of 78 harmful contaminants including lead, PFAS, chlorine, mercury and pharmaceuticals\u003c\/strong\u003e, while preserving healthy minerals. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"myyafv\" data-start=\"383\" data-end=\"627\"\u003e\n\u003cp data-start=\"385\" data-end=\"627\"\u003e\u003cstrong data-start=\"385\" data-end=\"422\"\u003eCertified Quality You Can Rely On\u003c\/strong\u003e – Fully \u003cstrong data-start=\"431\" data-end=\"485\"\u003eWQA certified to NSF\/ANSI standards 42, 53 and 401\u003c\/strong\u003e, ensuring the system’s filtration performance and structural quality meet recognized safety benchmarks. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"13nl3fe\" data-start=\"629\" data-end=\"857\"\u003e\n\u003cp data-start=\"631\" data-end=\"857\"\u003e\u003cstrong data-start=\"631\" data-end=\"675\"\u003eDedicated Brushed Nickel Faucet Included\u003c\/strong\u003e – Comes with a \u003cstrong data-start=\"691\" data-end=\"733\"\u003e100 % lead‑free, brushed nickel faucet\u003c\/strong\u003e that delivers filtered water on demand without altering your existing kitchen faucet. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"c9q4td\" data-start=\"859\" data-end=\"1096\"\u003e\n\u003cp data-start=\"861\" data-end=\"1096\"\u003e\u003cstrong data-start=\"861\" data-end=\"896\"\u003eCost‑Effective and Eco‑Friendly\u003c\/strong\u003e – Filters last \u003cstrong data-start=\"912\" data-end=\"945\"\u003eup to 6 months or 500 gallons\u003c\/strong\u003e, with \u003cstrong data-start=\"952\" data-end=\"969\"\u003eno wastewater\u003c\/strong\u003e during operation — making this system efficient and more sustainable than bottled water. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"gd3c0d\" data-start=\"1098\" data-end=\"1306\"\u003e\n\u003cp data-start=\"1100\" data-end=\"1306\"\u003e\u003cstrong data-start=\"1100\" data-end=\"1122\"\u003eDIY‑Friendly Setup\u003c\/strong\u003e – Installation is designed to be straightforward with all necessary parts included, often \u003cstrong data-start=\"1213\" data-end=\"1237\"\u003erequiring no plumber\u003c\/strong\u003e in standard under‑sink setups. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1mcohxv\" data-start=\"1308\" data-end=\"1530\"\u003e\n\u003cp data-start=\"1310\" data-end=\"1530\"\u003e\u003cstrong data-start=\"1310\" data-end=\"1343\"\u003eNoticeably Better Water Taste\u003c\/strong\u003e – Many users report \u003cstrong data-start=\"1364\" data-end=\"1392\"\u003eimproved taste and smell\u003c\/strong\u003e from filtered water compared to unfiltered tap water, ideal for drinking, cooking, coffee, and tea. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1awisb5\" data-start=\"1532\" data-end=\"1745\"\u003e\n\u003cp data-start=\"1534\" data-end=\"1745\"\u003e\u003cstrong data-start=\"1534\" data-end=\"1569\"\u003ePractical Flow for Everyday Use\u003c\/strong\u003e – Delivers water at a \u003cstrong data-start=\"1592\" data-end=\"1611\"\u003esteady ~0.5 GPM\u003c\/strong\u003e, suited to kitchens serving 1–4 people, though some find the flow slower than a regular faucet. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1eqm6c0\" data-start=\"1747\" data-end=\"1969\"\u003e\n\u003cp data-start=\"1749\" data-end=\"1969\"\u003e\u003cstrong data-start=\"1749\" data-end=\"1777\"\u003eMixed Long‑Term Feedback\u003c\/strong\u003e – While many owners value the water quality and ease of installation, \u003cstrong data-start=\"1848\" data-end=\"1903\"\u003esome report issues with leaks or fitting challenges\u003c\/strong\u003e if not installed carefully.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003e\n\u003cbr\u003eQ\u0026amp;A\u003c\/h5\u003e\n\u003cp data-start=\"223\" data-end=\"490\"\u003e\u003cstrong data-start=\"223\" data-end=\"266\"\u003eQ1: What is the A.O. Smith G6‑T4035NVR?\u003c\/strong\u003e\u003cbr data-start=\"266\" data-end=\"269\"\u003eA: The \u003cstrong data-start=\"276\" data-end=\"316\"\u003eA.O. Smith Signature 100 G6‑T4035NVR\u003c\/strong\u003e is a \u003cstrong data-start=\"322\" data-end=\"383\"\u003e40‑gallon commercial\/residential natural gas water heater\u003c\/strong\u003e built for reliable hot water delivery in homes sized for 3–4 people. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"492\" data-end=\"703\"\u003e\u003cstrong data-start=\"492\" data-end=\"539\"\u003eQ2: How much heating power does it provide?\u003c\/strong\u003e\u003cbr data-start=\"539\" data-end=\"542\"\u003eA: It features a \u003cstrong data-start=\"559\" data-end=\"600\"\u003e35,500 BTU low‑NOx natural gas burner\u003c\/strong\u003e that delivers efficient hot water and meets emissions standards. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"705\" data-end=\"957\"\u003e\u003cstrong data-start=\"705\" data-end=\"756\"\u003eQ3: What capacity and performance can I expect?\u003c\/strong\u003e\u003cbr data-start=\"756\" data-end=\"759\"\u003eA: The tank has a \u003cstrong data-start=\"777\" data-end=\"823\"\u003e40‑gallon nominal capacity (≈38 gal rated)\u003c\/strong\u003e and can produce an estimated \u003cstrong data-start=\"853\" data-end=\"886\"\u003e≈65 gallons in the first hour\u003c\/strong\u003e of use when sized appropriately. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"959\" data-end=\"1170\"\u003e\u003cstrong data-start=\"959\" data-end=\"1005\"\u003eQ4: What warranty does this model include?\u003c\/strong\u003e\u003cbr data-start=\"1005\" data-end=\"1008\"\u003eA: It comes with a \u003cstrong data-start=\"1027\" data-end=\"1072\"\u003e6‑year limited warranty on tank and parts\u003c\/strong\u003e plus a \u003cstrong data-start=\"1080\" data-end=\"1113\"\u003e1‑year limited labor warranty\u003c\/strong\u003e for peace of mind. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1172\" data-end=\"1440\"\u003e\u003cstrong data-start=\"1172\" data-end=\"1229\"\u003eQ5: What safety and diagnostic features does it have?\u003c\/strong\u003e\u003cbr data-start=\"1229\" data-end=\"1232\"\u003eA: Features include a \u003cstrong data-start=\"1254\" data-end=\"1322\"\u003eself‑diagnostic electronic gas control with LED status indicator\u003c\/strong\u003e and a \u003cstrong data-start=\"1329\" data-end=\"1401\"\u003ebuilt‑in safety system to reduce accidental flammable vapor ignition\u003c\/strong\u003e. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1442\" data-end=\"1662\"\u003e\u003cstrong data-start=\"1442\" data-end=\"1488\"\u003eQ6: Is it easy to install in tight spaces?\u003c\/strong\u003e\u003cbr data-start=\"1488\" data-end=\"1491\"\u003eA: Yes — its \u003cstrong data-start=\"1504\" data-end=\"1550\"\u003etall, slim 61.75″ H × 20″ diameter profile\u003c\/strong\u003e makes it suitable for narrow installations like closets or utility rooms. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1664\" data-end=\"1848\"\u003e\u003cstrong data-start=\"1664\" data-end=\"1696\"\u003eQ7: How durable is the unit?\u003c\/strong\u003e\u003cbr data-start=\"1696\" data-end=\"1699\"\u003eA: A protective \u003cstrong data-start=\"1715\" data-end=\"1758\"\u003eanode rod and fused ceramic tank shield\u003c\/strong\u003e help reduce corrosion and extend water heater life. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1850\" data-end=\"2040\"\u003e\u003cstrong data-start=\"1850\" data-end=\"1892\"\u003eQ8: Can it be used at high elevations?\u003c\/strong\u003e\u003cbr data-start=\"1892\" data-end=\"1895\"\u003eA: This model is \u003cstrong data-start=\"1912\" data-end=\"1961\"\u003ehigh‑altitude certified up to about 10,100 ft\u003c\/strong\u003e, making it versatile for many locations. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch5\u003e\n\u003cbr\u003eMaintenance Tips\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli data-section-id=\"13padw1\" data-start=\"93\" data-end=\"284\"\u003e\n\u003cp data-start=\"95\" data-end=\"284\"\u003e\u003cstrong data-start=\"95\" data-end=\"123\"\u003eFlush the Tank Annually:\u003c\/strong\u003e Drain and flush the storage tank at least once per year to remove sediment buildup that reduces efficiency and lifespan. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1f1ouse\" data-start=\"285\" data-end=\"491\"\u003e\n\u003cp data-start=\"287\" data-end=\"491\"\u003e\u003cstrong data-start=\"287\" data-end=\"309\"\u003eInspect Anode Rod:\u003c\/strong\u003e Check the sacrificial anode rod after the first 6 months and then annually; replace when heavily corroded to prevent internal tank corrosion. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"zib9va\" data-start=\"492\" data-end=\"668\"\u003e\n\u003cp data-start=\"494\" data-end=\"668\"\u003e\u003cstrong data-start=\"494\" data-end=\"520\"\u003eTest T\u0026amp;P Relief Valve:\u003c\/strong\u003e Lift the temperature \u0026amp; pressure relief (T\u0026amp;P) valve once a year to ensure proper pressure relief and safety. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1yp7xf5\" data-start=\"669\" data-end=\"871\"\u003e\n\u003cp data-start=\"671\" data-end=\"871\"\u003e\u003cstrong data-start=\"671\" data-end=\"703\"\u003eCheck for Leaks \u0026amp; Corrosion:\u003c\/strong\u003e Periodically inspect around water connections, drain valve, fittings, and vent piping for leaks or corrosion; address promptly. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"r4i3sz\" data-start=\"872\" data-end=\"1080\"\u003e\n\u003cp data-start=\"874\" data-end=\"1080\"\u003e\u003cstrong data-start=\"874\" data-end=\"900\"\u003eClean Exterior \u0026amp; Vent:\u003c\/strong\u003e Wipe the exterior to keep it free of dust; verify proper venting and clear obstructions to maintain combustion efficiency and safe exhaust. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"zxdvo3\" data-start=\"1081\" data-end=\"1250\"\u003e\n\u003cp data-start=\"1083\" data-end=\"1250\"\u003e\u003cstrong data-start=\"1083\" data-end=\"1115\"\u003eMonitor Temperature Setting:\u003c\/strong\u003e Keep thermostat at recommended ~120 °F to balance comfort, energy savings, and reduce scaling.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"A.O. Smith","offers":[{"title":"Default Title","offer_id":47830329458900,"sku":"Item #1055555 | Model #GT15-240-NI","price":1219.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/5481\/3634\/files\/image_3953ff67-f658-4768-8d2e-6ece18876f72-607753.jpg?v=1776876125","url":"https:\/\/buildyourultimatehangout.com\/products\/a-o-smith-signature-series-6-6-gpm-160000-btu-indoor-natural-gas-tankless-water-heater","provider":"Build Your Ultimate Hangout","version":"1.0","type":"link"}