RV-550 and M-550 Tankless Water Heaters from PrecisionTemp


Small spaces don’t have to mean short showers

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Did you know that you don’t have to give up relaxing, hot showers while living in your RV, trailer, boat, tiny house, or other small dwelling?

You heard that correctly: No more running out of hot water just before you rinse off the soap!

Good for the Earth, Good for Your Wallet

Each RV-550 tankless water heater from PrecisionTemp is assembled and tested by hand in the USA.

The RV-550 simultaneously conserves both water and energy, and at only 26 or 32 pounds, it weighs half to one third as much as a full 6-10 gallon water heater! If you’re a boater or camper, you know that carrying less weight means fuel savings on the waters or the road.

The heater only operates when a hot water tap is turned on. Without a tank of water to always keep hot, you’ll use up to 50% less propane.* A 20 pound tank of propane will provide approximately 940 gallons of hot water.

The RV-550 also has true automatic gas modulation, which means that it self-adjusts the gas usage based on variations in water flow and incoming water temperatures. This allows consistent temperature control without overheating the water in the summer or not heating it enough during colder weather.

It uses less than 1.5 amps of power when the water is running, and about 3 amps when the cold weather protection is activated.

Our tests have shown that a normal, continuous shower (with no flow restrictors installed) uses no more water than a start/stop Navy-style shower, and is far more enjoyable!

Four-Season Comfort

Oh, and did we mention that it’s the only tankless water heater with built-in freeze protection for four-season use? In order for it to function, your 12 volt and gas supply must remain on. This allows the burner to fire and electric elements to protect the system when it senses freezing temperatures.

Other brands of tankless heaters waste propane or water by preheating the water tank, or dumping fresh water on the ground to prevent freezing. The RV-550 can also be easily winterized for seasonal use.

The RV-550 boasts the highest hot water output in the industry at 55,000 BTU’s. That’s over 50% more power than most tankless water heaters on the market! What does that mean for you? More power means your water temperature remains constant, regardless of the flow rate or incoming water temperature (at a minimum of 0.5 GPM, optimal operation 1.0 GPM).

The RV-550 provides endless shower-temperature water at an impressive 1.5 gallons per minute, even with incoming water temperatures as low as 40ºF (4ºC). At that incoming water temperature, other tankless water heaters max out around only 1 gallon per minute of shower-temperature water — resulting in much weaker water pressure, and a less enjoyable showering experience.

The RV-550 also allows the user to operate your faucet or shower just like you would with a regular home water heater. Other tankless heaters require adjusting the water flow rate to adjust output temperature – the slower the water flow the higher the temperature, and the higher the water flow, the lower the temperature. There’s a serious flaw with this method: who actually wants a weak, hot shower or a strong, cold shower? Not us!

The RV-550 is the only water heater you’ll ever want or need to be comfortable in your small space, anywhere and any time of year!

More Power in Less Space

Multiple venting options allow the RV-550 to fit most any installation location. With the new option of floor venting through a tailpipe (NSP model only) and measuring only 13.5″ wide x 14.25″ high x 13.5″ deep, it offers unprecedented floor plan flexibility—freeing up valuable living space and making installation less complicated.

If you’re replacing an existing tank water heater, the RV-550 will easily fit into the space occupied by a ten gallon heater. If you have a 6 gallon tank, you will have to enlarge the wall opening by 2 inches or so.

The standard door is white aluminum and can be repainted to match an RV, or choose the plain aluminum option for Airstreams and other unpainted trailers.

Or, if you don’t have a wall opening or don’t wish to do make the enlargement, you can use the NSP model, which you can vent through the floor (or upward, in the case of the marine version).

*Natural gas model available by request at no additional cost — Please make a note with your order or contact us if you’d like this version

International orders:

Click here for details on international orders, Alaska, and Hawaii.

Tankless water heater support and technical questions:

Please call PrecisionTemp customer service at 1-800-934-9690 or email support@precisiontemp.com

Contact us or visit the manufacturer’s website at precisiontemp.com, for additional product technical information, installation manuals, and warranty information.

When will my order ship?

Tankless water heaters typically ship within 3 to 7 days, and sometimes faster, depending on their production schedule (they keep a small inventory, but are often hand-made to order). We will provide you with a FedEx Ground tracking number as soon as possible after it ships. Please read the RETURN POLICY here before placing an order, and triple check your measurements!

Additional information

Dimensions 13.5 × 13.5 × 14.25 in
Select a model type:

marine, wall-vented-white-door, wall-vented-unpainted-door, floor-vented-nsp


  1. P. Bennett

    I have had the RV 550 in my RPOD trailer now for about 3 weeks and I wish I had done this a long time ago. It has made a huge difference. The installation was not difficult even though I had to enlarge the opening in the side of the trailer. With just a few tries, I was able to set a comfortable temperature for showering and dish washing. It works with my Oxygenics shower head. No more heating up a whole tank of water just to wash a few dishes. On a few cold nights, I have heard the anti freeze feature kick in and that makes me very happy with my choice. The only thing I am not happy about is the paint job that I did on the bare metal door. I wanted it black to match the other doors on my trailer but I’m just not good with a can of Rustoleum. In the future I may get another door if that option is available and have someone else powder coat it. I would recommend this to everyone who has a tank water heater.

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