Seisco tankless hot water heaters, electric tankless water heater

Tankless Water Heaters
Residential Applications–Drinkable water

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Tankless Space Heaters
For heating your home

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	Model RA-18
4-chamber model Weight: 23 lbs Contents: 1 gal HTG elements: 4x5500w price: $720
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	Model SH-22
4-chamber model Weight: 23 lbs HTG elements: 4x5500w price: $1,095
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A tankless water heater is a very small but very powerful and extremely efficient electric water heating system. The tankless water heater, whose technology has earned 5 U.S. Patents and many more foreign patents, is much more than just a water heater.

The tankless water heater was measured to be over 99% efficient by an agency of the Federal Government.

The tankless water heating system designs consider not only electrical, and plumbing requirements of the application, but also location (space utilization), environment, potential preheating enhancements such as heat recovery (including waste heat recovery), solar, geothermal and more.

Why is our tankless water heater superior to all other electric tankless water heaters?

First, ours is the only electric tankless water heater, which enjoys a patented power sharing distribution method for activating the heating elements. This method allows each one of a multiple of heating elements to simultaneously provide substantially equal amounts of heat to the fluid as it flows through the heat exchanger. Other systems activate the elements individually to full power one after another, which creates hot spots in the heating chamber particularly at shut down. These hot spots literally boil the minerals out of the water creating excessive mineral buildup and discharge. This sequential activation used by other heaters also loads (works) certain heating elements more than others resulting in early failures.

Second, our tankless water heater is the only one that controls power to the elements in a very unique and patented power-modulating pattern. This feature insures that the use of our tankless water heater does not inherently create disturbance (flicker) in the lighting circuits. This is very important since the proper temperature control for electric tankless water heaters depends on modulating or instantaneously varying the power to high wattage heating elements. Without the our tankless water heater's patented control, one can experience lights that flicker in the same fashion as if you were at your thermostat rapidly flipping the air conditioner or electric heating off and on. It should be remembered that in any application the electrical service to the building should be properly sized to accommodate the addition of all major electrical appliances including, the electric tankless water heater. Some rural residences, even those that don’t have electric water heaters, experience light flicker even from hair dryers as a result of inadequate or improperly designed electrical service to the house.

RESIDENTIAL INCLUDING MULTIFAMILY: There are many ways to use a tankless water heater in your home, apartment, condominium, or manufactured house. The major applications are highlighted below.

Simultaneously provide the domestic hot water and/or space heating requirements with a tankless water heater designed to replace expensive boilers when steam isn’t required.

OPTIMIZE EFFICIENCY WITH SOLAR, OR OTHER PASSIVE WATER HEATING OR PRE-HEATING SYSTEMS.

Any of the above applications can be provided exceptionally well in conjunction with a solar water heating system. The efficiency of any solar water heating system is substantially increased through the use of a tankless water heater. The reasons are simple.

The storage tanks of a typical passive system are equipped with either electric resistance heating elements or gas burners that are activated in response to thermostatic controlled switches. The thermostats are typically set as they would be in a standard stand-alone water heater at 135° F. For safety reasons, the solar collector’s fluid thermostat is most generally set at a maximum of 160º F. This controls the maximum temperature of the solar heated fluid that can be used to provide hot water to the storage tank, a difference of only 25ºF. This is important to remember. When the incoming water temperature is 45º F, the temperature rise required to reach the tanks set point of 135ºF is 90º. The auxiliary heating source, heating/recovering much faster than solar, will always provide this temperature rise. The solar collector, whose maximum fluid temperature is 160º F, can increase the fluid temperature, only by an additional 25º or a maximum of 22% of the total temperature rise.

As hot water is used, fluid is drawn out of the tank and cold incoming water is introduced. The tank’s fluid temperature quickly drops below set point particularly in colder times of the year. The tank thermostat activates the auxiliary heating source, which again heats the water during and after use much quicker than the solar, overriding the solar contribution and thus limiting the system’s overall efficiency.

The solar water heating system, which uses a tankless water heater, utilizes a storage tank without an internal auxiliary heating source or thermostat. The solar collector is able to contribute 100% of its potential heat to the stored water, limited only by the pre-set maximum, typically 160º.

As water is being used, it is drawn out of the tank, then through a tempering valve. The tempering valve regulates the water temperature by adding cold water when necessary to insure that the outflowing water temperature does not exceed a safe preset temperature (i.e. 125ºF). The tempered water then flows through the tankless water heater, externally mounted down stream of the storage. If the water passing through the tankless water heater is already hot enough the tankless water heater does not turn on. As the water temperature drops, the precise heating control adds only enough heat to the water to incrementally bring the temperature up to the desired set point. When water use is terminated the tankless water heater turns off and the solar system is allowed to return to providing all the heat it can to the stored water between periods of water heating use. In such a system, properly designed, the tankless water heater is completely capable of providing 100% of the hot water for the application when solar heating is not available. The tankless water heater, however does not heat water except when needed and never heats more water than is actually used, (i.e. standby). The tankless water heater precisely adds only the heat required to raise the water temperature of pre-heated water to the desired minimum set point temperature.

The tankless water heater improves the utility and efficiency of any water heating system coupled with a source of pre-heated water including geothermal, de-superheaters, waste heat or typical heat recovery systems.