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Understanding Your EZ Ultra

Detailed explanation of the EZ Ultra

This page was built for our existing and potential customers. On this page we expand upon the details and components of the EZ Ultra and how they work.

About the exhaust system:

As with all models of “Direct Vent” tankless water heaters made by all manufacturers, the stainless steel exhaust and air intake system is designed as an integral component of the specific make and model of the heater itself. There are no alternative ways to exhaust this EZ Ultra tankless water heater other than the exhaust designed for it. Unlike the vast majority of tankless manufacturers, we supply our standard stainless steel intake/exhaust system free of charge with the purchase of our heater. Additional extension pieces are available from our company. As with all direct vent tankless heaters from all manufacturers, our exhaust and intake components are exclusive to our unit, do not interchange with those of other manufacturers and are only available from our company. These items cannot be purchased at hardware stores. The intake and exhaust is combined in one pipe. The exterior diameter of the exhaust is 100mm (3.94 inches). The interior exhaust pipe is 60mm in diameter (2.36 inches). This interior pipe is the exhaust taking the combustion gasses outside the home under pressure. The area between the interior pipe and the exterior is the intake tract for the combustion air which is being drawn-in under suction. For this reason, the joints on the pipes have sealed interior connections and the exterior must also be wrapped with special metallic sealing tape. What this means is that the exterior of the pipe itself never gets hot as it is cooled by the incoming intake air supply. When the heater is running, an almost equal amount (volume) of combustion air is coming into the intake tract as exhaust exiting through the center exhaust pipe. When the heater is not running, no air or exhaust is passing through this pipe. With this system there are several advantages. Primarily you are not using room air for combustion and therefore do not need to calculate available combustion air space and you are not extracting air conditioning or heat from your home.

However, please note: You can never connect a direct vent tankless heater to an existing exhaust system or connect it to your furnace chimney or combine it with the exhaust for any other type of gas fired device. Additionally, you must always exit the home horizontally with an approximate (minimum) 2 degree down slope. This is why these types of heaters are designed to be mounted on an exterior wall. In fact, the angle pipe that connects to the top of the heater has a bend slightly sharper than 90 degrees. The maximum exhaust length for this heater is 2 meters (6.5 feet). The reason that the exhaust and intake must be mounted horizontally at a slight down slope is to keep combustion related and naturally occurring atmospheric condensation from entering the interior of the heater body. The reason that there is a limit of 2 meters for the length of the exhaust/intake pipe is because of the draw of intake air required. If the system were longer, the intake air supply will not be sufficient and the unit will not operate correctly and will shut down via redundant safety devices that are built into the design parameters. Because of the previously mentioned condensation drainage requirements, this direct vent tankless water heater can never be vented vertically. It cannot ever be installed in any way in which it will exit through the roof.

About the control panel:

The control panel read-out is in Celsius. On our web site is a conversion chart for Celsius to Fahrenheit at this link

The control panel has three buttons.

On and Off switch. When the machine is turned on, the panel illuminates and indicates the pre-set temperature which is chosen by the user and held in memory as long as there is a power supply to the heater. When there is a power failure, this switch must be pressed again to turn the machine on. Once the machine is turned on, it stays on as long as there is a constant power supply to the power cord. (which is a standard USA 110 volt A/C three prong grounded plug-in) If the home owner would like to turn off the heater for any reason, simply press this button and the control panel display will turn off and become a blank black screen. (For example, to turn the machine off while on vacation.) Unlike conventional water heaters, after the heater has been turned-off, upon re-starting the unit there is no pilot light to try to ignite. (This tankless heater has electronic ignition and there is no standing pilot light)

Temperature “UP” button which has the symbol ( Λ ). This raises the temperature setting.

Temperature “DOWN” button which has the symbol ( V ). This lowers the temperature setting.

There are additional illuminated readouts on the control panel.

One shows that water is flowing. (This symbol is an illuminated light that looks like a “shower head” in operation)

There is one showing that the fan is running. (This symbol is an illuminated light that looks like a “fan blade”)

There is an ignition symbol that shows that there is a heating process happening in the fire box and heat exchanger. (This symbol is an illuminated light that looks like a “flickering flame”)

There are additional alpha-numerical readouts that are signs of a malfunction. There is a list of these codes in the owner’s manual that comes with the heater and is also a free download on our website at this link

Connecting the heater to the water and gas supply:

The cold water intake and hot water exit connections are USA standard ½ inch pipe thread.

NOTE: On the intake water connection (cold pipe) there is a control valve. This is only on the heater unit to control water flow if the heater is being used as a stand-alone shower and there is no other faucet or similar device for water flow control. (In standard installations, this valve should be left in the wide-open position. It serves no other purpose.)

The gas connection is USA standard ¾ inch pipe thread. NOTE: If using a nipple (NPT) connection, you will need to add a ¾ to NPT adapter which is available in home improvement and hardware stores nationwide.

ATTENTION: Gas connections must be absolutely free of any leakage. Proper testing procedures must be taken to prevent gas leaks as they pose a grave danger of fire and/or explosion. This is why we always recommend professional installation of all of our products.

Safety features:

All modern direct vent tankless heaters are sophisticated energy efficient machines. These devices are well designed, well developed, and well proven from many years of operation in millions of homes in Europe, Asia and the USA. There are numerous safety devices inside any modern tankless water heater. These internal safety default devices work in cooperation with the designed components of the heater including the intake and exhaust system. Failure to follow the specific installation guidelines may cause one or more of the safety devices to shut-down the unit or simply not allow it to start. The redundant safety features are there for valid reasons and none of them can be defeated nor should any attempt be made to do so.

WARNING: To attempt to defeat a safety switch or redundant safety feature of the heater immediately voids all warranty expressed or implied and will pose an extreme potential danger for the user.