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Reviews & Guides · Appliances

My Rinnai RXP199iN: steady hot water, but more noise than expected

Reviewed: Rinnai RXP199iNRegional reference: Rinnai RXP199iN (United States)

I replaced my 14-year-old tank water heater with a Rinnai RXP199iN. Hot water is steady, but the noise is more noticeable than I expected.

Close-up of a Rinnai cardboard appliance box with a product label for model RXP199 iN, marked natural gas and 199,000 BTU/h, with barcodes and a QR code.
A cardboard Rinnai box for a condensing tankless water heater, marked “RXP199 iN” and “REU-NBP3237FF-US-N.” The box says isolation valves are sold separately, gives an outdoor vent cap part number, and warns the heater is not suitable for pools or spas.
A gray Rinnai appliance, apparently a tankless water heater, sits partly unpacked in a cardboard box with plastic wrapping. Two black circular vent fittings are mounted on top, and printed installation instructions are attached to the front. Shoes and other household items are visible in the background.
A printed Rinnai tankless water heater installation guide titled “Key Points for a Successful Installation,” with illustrated sections on initial settings, venting, typical installation, parameter settings, recirculation pump, gas conversion and condensate drainage.
A phone gallery screenshot labeled “3 of 3” shows plumbing beneath a sink: braided metal hoses and a black valve assembly connected to white pipes. A blue caption says, “Easy to install in under one hour.”
The underside of the Rinnai water heater shows connections marked HOT, COLD and GAS, with an installation sheet and EnergyGuide label lying across its casing.
A silver Rinnai tankless water heater is mounted in a wooden utility area with pipes and hoses connected above and below. Its display reads “110,” and yellow energy and white registration labels are attached to the front.
A shopping app screenshot shows a listing for a SharkBite 3/4-inch tankless water heater valves installation kit, pictured with brass valves and red and blue handles. It is priced at $139, rated 4.4 from 88 reviews, with one in stock for pickup at Concord Township and free delivery; an Add to Cart button is visible.
A Home Depot mobile shopping screenshot shows a sponsored listing for a Rinnai Sensei Super High Efficiency Plus 11 GPM natural-gas tankless water heater, model RXP199iN, priced at $1,778.00 with expert installation available, free store pickup and delivery, a 4.3-star rating, and an Add to Cart button. Below it is a “Rated 4 Stars & Above” section with plumbing fittings pictured.
A shopping-app screenshot shows search results for “3/4 Gas.” The main listing is an Everbilt 3/4-inch brass FPT one-piece gas valve, with a yellow handle, rated 4.9 from 182 reviews and priced at $15.94; it shows nine in stock for pickup at Concord Township and free delivery. Part of a HOME-FLEX listing is visible below.
A mobile Safari screenshot of a ChatGPT conversation in Chinese about installation costs for a Rinnai RXP199iN. It lists ventilation accessories, gas-line adjustments, water connections, and possible electrical work, estimating materials at $300–$600 and labor at $1,500–$2,500, with extra modifications potentially costing more.
A Navien condensing combi-boiler carton secured with turquoise straps. The label reads NCB-250/150H and Natural Gas.
A Home Depot product listing for the iSpring Ultimate Protection whole-house water filter, showing a three-housing blue filter system, three replacement cartridges and a separate clear filter housing. The listing shows a 4.5-star rating from 30 reviews and a price of $926.99.

My household’s storage-tank water heater finally retired after 14 years—unfortunately, it flooded the basement. After a lot of research and debate, I replaced it with this one.

Downsides: It is noisier than I expected, though the sound is acceptable in the laundry room. It was expensive. The Wi-Fi control feature requires buying a separate module.

Upsides: Water pressure and temperature are steady, and it uses less gas. There is a continuous supply of hot water.

At the time, the water heater cost about $1,900 after tax at market price. Changing the water pipes and gas line (from 1/2 inch to 2/4 inch), plus various fittings, valves and pipes, came to about $400. That does not include tools! I installed it myself. To filter the water and help the heater last longer, I also installed a whole-house water filtration system; materials cost $700.

Later, I plan to install a Navien NCB-250/150H in another house and compare the two. I’m still trying things and comparing—only experience gives you a say!

Source: xing（醒） · Xiaohongshu · 2025-06-09 · 林内无储水式燃气热水器. Search this Chinese title in Xiaohongshu to find the original post.

Before You Buy

Models in your region

Rinnai lists the RXP199iN in its US SENSEI RXP range. The owner’s carton identifies this same model in its natural-gas configuration.

Model in this review Related regional model What to know
Rinnai RXP199iN Rinnai RXP199iN (United States) US SENSEI RXP-series tankless water heater. The owner’s carton specifies RXP199iN and natural gas.
Model in this review
Rinnai RXP199iN
Related regional model
Rinnai RXP199iN (United States)
What to know
US SENSEI RXP-series tankless water heater. The owner’s carton specifies RXP199iN and natural gas.

Noise and hot-water experience

After replacing a 14-year-old storage-tank heater that had flooded the basement, the owner found the RXP199iN noisier than expected. The sound was acceptable in the laundry room; this is a personal observation, not a measured noise level.

The owner reports steady water pressure and temperature and a continuous supply of hot water. They also say the heater uses less gas, but give no metered consumption or comparison conditions, so the account does not establish the size of any fuel savings.

Accessories, installation and costs

The RWM200 is an optional, separately sold Wi-Fi module for phone-based control and recirculation scheduling. The owner’s note that Wi-Fi needs an extra module matches that accessory arrangement, but the account does not say they bought or used it.

Rinnai RXP199iN · United States

The owner recorded about $1,900 after tax for the heater, about $400 for pipe changes and other materials excluding tools, and a separate $700 for whole-house filtration materials. These are historical expenses from the June 2025 account, not a current installed quote. The caption says the gas line changed from 1/2 inch to 2/4 inch; in a same-day reply, the owner gives 3/4 inch instead.

Source: xing（醒） · Xiaohongshu · 2025-06-09 · Same-day author comment on 林内无储水式燃气热水器. Search this Chinese title in Xiaohongshu to find the original post.

The RXP199iN has an internal recirculation pump. Its factory Smart-Circ setting learns hot-water use and operates recirculation around that pattern on subsequent days. A fixed schedule instead uses a compatible MC-195T-US controller or RWM200 Wi-Fi module and disables Smart-Circ. These are manufacturer capabilities, not functions the owner reports testing. Rinnai requires trained, qualified installation and service.

Rinnai RXP199iN · United States

The Navien comparison is still future

The owner plans to install a Navien NCB-250/150H in another home, but has not reported a completed comparison. Their current noise and hot-water observations are specific to the Rinnai RXP199iN and cannot establish how the Navien performs.

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