A tankless water heater is always better than the heaters with a tank because of its sustainability and efficiency. Among other tankless water heaters, Eccotemp FVI12-LP Liquid Propane Gas Tankless Water Heater has been a front runner in the market when it comes to customer choice. It uses liquid propane to heat the water and is aptly designed for any indoor places like small apartments, cabins, etc. There is a horizontal ventilation kit made of stainless steel, which is used to run the unit with safety and efficiency. It produces hot water instantly with the flowrate up to 4 GPM. The Eccotemp FVI12-LP needs a 120 volt UL listed power cord, which activates the internal ignition system and digital temperature display. This unit enables only when the water flow is running, which helps to save a lot of energy and also minimizes the electricity bill.
Features of Eccotemp FVI12-LP Liquid Propane Water Heaters
Propane gas fuel
This unit uses liquid propane as its fuel. The propane fuel heats the water the moment water flow starts.
Unlimited hot water supply
The moment the water passes through the heat exchanger, instant hot water will be produced with a flow rate of 4 GPM.
Manual temperature setting
It contains standard 1/2" NPT water fittings, and the temperature setting is manually controlled. This allows the user to set the system perfectly combining the gas flow and the temperature for the desired outcome. Doesn't make a sound while running. The temperature is shown in a digital display on the unit.
Easy installation process
The installation process can be done without any expert hand. Its compact size and smart shape is easy to mount on any indoor wall with proper electronic ignition system which has to be plugged into a standard 120-volt electric outlet with UL-listed electrical components.
Ventilation
This unit uses a power ventilation point to run safely. The vent kit is made of stainless steel.
Energy saver
The unit works only when the water flow is running. So once the water flow is shut down, the machine will stop working, saving a lot of energy from being wasted. An excellent choice for any small indoor place.
Great technical team
The professional team is always ready to help out the customer regardless of the timing or place. They are polite with the customer and well informed about the issue. They even call customers back to know their feedback or any other complaints.
Pros
- Very budget-friendly product. Not only it provides you the top-notch service like other high-priced water heater but also helps cut down the electricity bill.
- The installation process is quite easy to follow. Because of its lightweight built and smart size, it can be put on the wall with no time.
- Eccotemp’s customer service is unbeatable in many ways. The product comes with a 2 years warranty and an experienced technical team ready to answer the call any time.
- While producing instantly hot water, this product is also a big energy saver. The propane fuel will heat the water only when the water passes through the heat exchanger. So, if the water supply is off, the unit will not work.
Cons
- The flow rate is not apt for continuous use. And it also can not be used for more than one point.
- The temperature setting system is a bit hazardous. To get the perfect temperature that you desire, both knobs controlling the gas flow and the temperature have to be combined with accuracy which is a tricky thing to achieve at first.
Water Heater Flow Chart

Frequently Asked Questions
When should I shut off the gas flow?
The gas is only used when the water runs through the heater. So no outside intervention is needed.
Do we need to install any batteries to run this unit?
No. There is no use of batteries in this product.
Does it run with gas?
Yes, liquid propane is used to produce hot water.
Does it come with a digital temperature setting?
No, the temperature setting is manual. User has to combine the gas flow and the temperature to get the desired hot water flow.
Can I use this unit for outdoor spaces?
No, it is best to use this for indoor places.
Is it too big and heavy?
No, this unit is very light and easy to fit for its smart shape.
How many years of warranty will I have?
This product sadly comes with a limited 2 years warranty.
How do I adjust the ventilation?
The unit has to be mounted vertically for the ventilation to work.
Installation Guide
The installation process for this unit is very easy. You just have to follow some simple steps to adjust the unit. At first, the location of the heater has to be selected. This unit is mounted on the wall vertically for the ventilation to work properly. It comes with a ventilation kit for safe use. The unit has two knobs to control both the temperature and water flow.
To install this water heater, you need to follow these instructions.
1. Local codes or the latest edition of American national fuel gas code.
2. Utility company requirements.
To put this tankless water heater indoor, you must not locate this one where the leakage of the heat exchanger is adjacent. The paan must not restrict the combustion of airflow. After choosing the location for installing the water heater, you need to check if the water supply has sufficient pressure. You need to clean the water filter and place that one in the right place. After checking the water pipeline, if they are insulated, you need to focus on gas supply. You need to use the pipe joint compound, which is approved. After that, you have to check if the pressure relief valve is installed properly. The line has to be discharged to protect the water heater from freezing. After that, you have to install vent terminal properly. You must have to check if all vents are supported, and vent connectors are securely fastened together with high-temperature silicon and airtight. You have to take care of sufficient combustion air.
Then you need to do one more thing. You have to observe the maximum and minimum vent length. Now, you need to check the electric wiring part. You have to be sure if the voltage matches the rating plate of the heater. If the water heater is grounded properly and if the supply cords meet all the local codes, then done you are! You must have to take care of hot and cold line installation, and you must have to test the leak test of the water heater and the gas connection.
Conclusion:
Hot water is a necessity in winter. But most water heater in the market either charges too much for good service or not efficient enough with the low price. But eco temp FVI12-LP is a good catch considering the price and the features it provides along with it. It saves energy as well as cuts down the electricity bill a lot. The technical team is also very co-operative when it comes to customer service. If you want to buy a water heater that will provide you a good service with a low budget, this unit can be an ideal choice for you. Also, it comes with a service is also a two year warranty, which is a good deal considering all other aspects.
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