VancEpic RH12KG-C-NG Indoor Natural Gas Tankless Water Heater, 120,000 BTU

The VancEpic RH12KG-C-NG is an indoor natural gas condensing tankless water heater listed with a 120,000 BTU output and 5.1 gpm flow rate. Its LED control and claimed anti-freeze function add useful operating features, while the compact listed dimensions may suit limited installation space. The listing’s capacity, dimensions and power details need careful interpretation before choosing a compatible installation.

At a glance

The listing identifies the unit as a condensing, indoor natural gas tankless heater.
Manufacturer claims an LED control that adjusts temperature from 95°F to 149°F and displays gas and water flow rates.
An anti-freeze function is claimed, along with protections against overheating, dry burning and exhaust blockage.
The stated 5.1 gpm rate and 120,000 BTU output are presented for multi-fixture household use, but actual suitability depends on installation conditions.

Price

$399.00Save 20%

Reference price: ~~$499.00~~

Price checked: Nov 14, 2026

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Pros and cons

Pros

LED control is described as showing flow information and allowing temperature adjustment.
The stated wall mounting and compact listed width and height may help with constrained installation space.
The listed kit includes a condensate drain line and vent pipe, alongside an assembly kit and manual.

Cons

The unit requires a natural-gas installation and 120-volt electrical supply, so it is not a fit for homes lacking either connection.

Technical specifications

16 specifications

Identity and heating
Brand	VancEpic
Model	RH12KG-C-NG
Power configuration	gas_powered
Heat output	120000 british thermal units
Flow rate	5.1 gpm
Maximum temperature	149 °F
Maximum pressure	150 psi
Capacity listed	5.1 gallons

Electrical and controls
Wattage	114 watts
Voltage	120 volts
Display	LED Display

Dimensions and installation
Mounting type listed	Wall
Dimensions listed	14.17"W x 6.57"H
Weight listed	27 pounds

Construction and warranty
Material	Stainless Steel
Manufacturer warranty description	2 Year Manufacturer

What to know before buying

Listing details to confirm

Listing details are inconsistent or unconfirmed: capacity is given as 5.1 gallons even though flow rate is separately listed as 5.1 gpm, dimensions provide width and height only, and the 114-watt figure is described in the feature text as an anti-freeze heater rather than a clearly specified overall power draw. Confirm the applicable installation, venting and performance details for your site before purchase.

What’s in the box

Included

Assembly kit x1
Condensate drain line x1
Manual x1
Vent pipe x1
Water heater x1

Who is it for?

A good fit for

Households considering an indoor natural gas tankless heater with a listed 5.1 gpm flow rate.
Buyers who want an LED control and a claimed anti-freeze function.
Installations where a wall-mounted unit with a listed width and height may be appropriate.

Less suited to

Homes without a natural gas supply or 120-volt electrical connection.
Buyers who need confirmed complete dimensions or a clearly defined capacity specification before planning installation.

VancEpic RH12KG-C-NG Indoor Natural Gas Tankless Water Heater, 120,000 BTU · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 2 ratings

5 stars55%55%
4 stars45%45%
3 stars0%0%
2 stars0%0%
1 star0%0%

Only aggregate ratings are supplied, with a very small sample. The rating distribution is entirely four- and five-star, but it does not establish what customers liked or how the heater performs. Buyers should weigh it alongside the listing’s stated gas connection, flow rate and installation details rather than treating the ratings as evidence of suitability.

Frequently asked questions

Is the VancEpic RH12KG-C-NG intended for indoor use?

Yes. The product title identifies it as an indoor natural gas tankless water heater.

What flow rate does the listing give?

It lists a flow rate of 5.1 gpm. The listing also calls capacity 5.1 gallons, which is a separate and unclear claim, so do not treat those values as equivalent.

What temperature range is stated for the control?

The feature text says the LED control can set temperatures from 95°F to 149°F. The details also list a maximum temperature of 149 °F.

What is listed in the package?

The manufacturer contents list names an assembly kit, condensate drain line, manual, vent pipe and water heater, each with a quantity of one.