Rinnai RU98EN Review

A non-condensing tankless water heater is considered more efficient compared to the conventional tank-equipped type, but a condensing model is the most efficient of all, such as the Rinnai RU98EN. It is one of the most powerful water heaters from Rinnai categorized under Ultra series, featuring 0.95 energy factor, 9.8 GPM, and an easy-to-use temperature controller.

Main Features and Benefits

1. Condensing Water Heater – As mentioned earlier, the Rinnai RU98EN is a condensing tankless water heater, which is considered the most efficient model compared to others currently available. In a combustion process, fuel is burned thus it produces hot gases. In this case, hot gases are used for heating the water. With a non-condensing model, some of the hot gases are simply pushed through the vents to the outside, therefore wasted.

Rinnai RU98EN imageA condensing tankless water heater, such as the RU98EN, transfers the exhaust gases to heat the incoming water. In other words, energy optimization is much better.

2. Two Heat Exchangers – In order to operate as a condensing water heater, the Rinnai RU98EN uses two heat exchangers; one is made of steel, while another is made of copper. The stainless heat exchanger is used for recapturing the heat produced by the combustion process. The copper-made one uses pre-heated water to deliver optimum heating process above the gas burner. Cold water is already pre-heated before it flows through the primary burner, allowing for optimum heating process. According to the manufacturer, the RU98EN reaches energy factor of 0.95 for either natural or propane gas. [Read more...]

Eccotemp FVI-12-NG Review

As the name suggests, a tankless water heater doesn’t store water, but it can provide hot water on demand thus it is more efficient for the sake of energy saving. The initial price is fairly expensive, such as the Eccotemp FVI-12-NG, but the overall money-saving in the long run is far better.

Main Features and Benefits

The Eccotemp FVI-12-NG is actually very similar to the FVI-12-LP, but the former is powered by natural gas. It is an indoor appliance capable of delivering up to 3.4 GPM of hot water, which should be sufficient for small to medium houses. You can also use it perfectly for cottages and cabins.

Eccotemp FVI-12-NG imageIt features a compact design measuring at 15-inch x 24-inch x 4-inch and weighing only around 20 pounds, but this tankless water heater brings separate gas and water controls as well as a digital display for temperature on the front. With such controls and indicator, you can manually adjust water flow and the intended temperature precisely. The appliance also has 0.5 inch NPT inlet and outlet as well as gas connections. The Eccotemp FVI-12-NG starts by an electronic ignition that requires a minimum of 40 PSI.

Apart from its space-saving design, this water heater is also an energy-saving appliance. This small yet modern water heater will only use around 2 watts of power during standby or idle state, while it requires 10 watts when operating. Since this is a tankless type, it will only use the gas when you are using it. A horizontal stainless steel vent kit is included with the purchase, so it is ready to install out of the box. According to the manufacturer, the water heater requires 120-Volt household electric outlet.

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Rinnai V65EN Review

A truly reliable and durable tankless water heater can be difficult to find, but there is at least the promising Rinnai V65EN which offers the excellent 10-year warranty on heat exchanger, 5-year warranty on labor, and 1-year warranty on parts. This tankless water heater delivers up to 5.3 gallons of hot water per minute.

Main Features and Benefits

As mentioned earlier, the Rinnai V65EN delivers a maximum of 5.3 GPM of hot water, so it should be good enough to serve more than two bathrooms in your house in the same time. The unit is for outdoor installation only and powered by natural gas with maximum BTUs of 120,000. The overall dimension is fairly compact measuring at 14-inch W x 23-inch H x 9-inch D and it weighs 43.6 pounds. This tankless water heater is intended for residential applications and certified for installation in mobile homes also.

Rinnai V65EN imageThe V65EN uses a direct electric ignition device that requires a minimum flow rate of 0.4 GPM to light the burner. The maximum pre-set temperature range starts from 98 to 120 degree F, but you can use the provided temperature control to widen the range from to a maximum of 140 degree F.

The provided controller is the standard one, but this unit is compatible with any Rinnai digital controller which you can purchase separately. The controller also functions as error code indicator, so you can immediately figure out any possible problem and fix the issues. All error codes are listed in the user manual along with the possible remedies.

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Eemax SP3512 Review

Compared to its tank-equipped counterpart, tankless water heaters generally have smaller design, heat water more quickly, and are energy-efficient. One of them is the Eemax SP3512. The water heater is small and lightweight, but it is fully loaded with good features suitable for various applications. This appliance is designed to work with 0.5 GPM hand wash sink.

Main Features and Benefits

The Eemax SP3512 is indeed a small appliance measuring at 10.75-inch x 5.25-inch x 3-inch, and it weighs only around 4 lbs. Besides featuring a compact design, this tankless water heater also brings a Direct Heating Technology that allows the appliance to heat water faster yet it prevents wasted energy.

Eemax SP3512The heating element will transfer heat directly to the water and it shuts down instantly after you are done using it. The cooling process is as well very quick, meaning there is only minimal overshoot to prevent inefficient use of energy.

According to the manufacturer, the Eemax SP3512 works best when used for hand wash sink in a shopping mall, commercial building, school, stadium, modular office, and other public facilities. It is also compatible with sensor, metering, and hands-free faucets. The flow of water will activate the heater so there is no standby heat loss. It requires 0.3 GPM to start the appliance, and the temperature rise at 0.5 GPM is 48-degree F.

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Rheem RTG-84XN Review

Every tankless water heater generally provides hot water on-demand, meaning it heats water temperature almost instantly anytime you need it. Besides this main function, the appliance is usually equipped with some additional features to improve ease-of-use, energy efficiency, and more. One of the most fully-featured tankless water heaters is the RTG-84XN by Rheem.

Main Features and Benefits

Besides its function as a tankless water heater, the Rheem RTG-84XN has at least 4 major additional features including energy-efficient, low minimum flow rate, digital display, and warranty coverage.

1. Energy-efficient

Image of Rheem RTG-84XN.In terms of energy efficiency, this appliance is smartly equipped with all-copper heat exchanger. Copper is one of few materials with high thermal conductivity, meaning it has an excellent ability to conduct heat. When used for heat exchanger, copper is better than other common metals such as stainless steel and aluminum. In fact, copper has a higher thermal conductivity compared with all other metals except silver. Since heat can pass through copper very quickly, less energy is required to produce hot water.  [Read more...]