STSS CO INC PRODUCT REVIEW

     There is a growing market for water storage tanks for many applications. STSS CO INC manufactures water storage tanks that are designed for each of the following applications.

     The STSS tanks have advantages not found in other tanks on the market. Our tanks are light weight, are fully manufactured and collapsed and crated for shipping. They can be moved through virtually any doorway for easy installation. The tanks are durable, cannot rust and are designed for minimum maintenance

APPLICATIONS

1. SPACE HEATING generated from solar, coal/wood, off-peak electric and conventional fuels such as oil and gas where a buffer tank is required to eliminate cycling. Excessive boiler cycling damages control parts, reduces the combustion efficiency of the boiler and results in unwanted service calls. A boiler combined with heat storage increases customer satisfaction because it all but eliminates "cold" calls.

     a. Warm water baseboard. Hydronic baseboard can heat an entire home when properly designed
     according to a calculated heat loss. It just takes more baseboard for warm water applications.

     According to the water temperature chart, baseboard will deliver 228 Btu's per foot with 120 Deg. F.
     water, 274 Btu's per foot with 130 Deg. F. water or 335 Btu's per foot with 140 Deg. F. water.

     b. Warm air furnaces and heat pump systems. In warm air - rather than hot air - applications,
    larger sized ducts are required to move Btu's at a CFM adequate for the job. The STSS in-tank heat
     exchangers and the duct water- to- air heat exchangers are designed to provide 100% of the home
     heating down to a tank temperature of 120 Deg. F., at design outdoor temperature.

     c. Radiant floor heating. When combined with heat storage, radiant floor heating is the best method
     for heating a home because tank temperatures can be as low as 95 Deg. F. and still provide 100% of
     the designed heating load. This means that the storage tank can be smaller than for higher temperature
     applications.

     Radiant floor heating has an additional benefit. Thermostat settings can be five to seven degrees lower
     than conventional heating system settings. This will increase efficiency by 20% to 35% compared to
     conventional distribution. It is important to note that, although the thermostat setting has been lowered,
    the comfort level remains high.

     d. Solar heating. Solar energy requires the use of low temperature heating distribution methods.
     Warm air distribution and radiant floor heating distribution are the only two practical distribution
     methods because they operate at the lowest tank temperatures therefore, allow the solar collectors to
     transfer more heat than any other distribution method. The lower the tank temperature the greater
     benefit from the solar collectors.

     Because domestic hot water comes from a well or a city source that is between 50 and 60 Deg. F.,
    solar domestic hot water applications should be included with every space heating system.

2. DOMESTIC WATER HEATING.

     a. Solar domestic water heating. STSS has a cost effective line of equipment for residential and
     small commercial solar domestic water heating. These tanks can be used with any quality solar
     collector on the market.

     The tanks commonly used for these solar applications are 184, 228, 275 and 328 gallon capacity
     tanks.

     The 184 gallon tanks will provide sufficient storage capacity for the output of two 4' by 8' solar
     collectors. 
     The 228 tank will provide for three collectors.
     The 275 tank will provide for four collectors.
     The 328 tank will provide for five or more collectors. 328 gallon tanks are often installed with four
     collectors to improve the efficiency of the collectors.

     Most of the water heaters on the market are limited to 120 gallon capacity because larger tanks can't
     be moved through most doorways. The STSS tanks have solved the problem with tanks crated at 19
     inches wide.

     STSS solar domestic water heaters come with a double stacked coil specifically designed for solar
     domestic water heating. This coil qualifies as a double-walled heat exchanger.

     An important option that can be included in the solar tank is an electric backup element with a control.
     This feature can replace the need for an additional water heater and will provide hot water when the
     sun isn't shining.

     b. The OPES Water Heater. The OPES water heater is designed and built to resist the problems
    that shorten the life of the conventional water heater.

     The elements last longer. The vertical spiral heat exchanger separates the elements from the mineral-
     laden water supply eliminating mineral buildup on the elements and in the tank.

3. HEAT EXCHANGE COILS

     a. For Space Heating and Domestic Water Heating.

     All STSS heat exchange coils are constructed from 3/4 inch copper in a vertical spiral configuration,
     22 inches in diameter and 42 inches high. They are self-supporting and can stand alone on the bottom
     of the water storage tank.

     This coil design allows for heat input by moving water from the top to the bottom of the coil. For heat
     output, water is moved from the bottom to the top of the coil. This method of heat transfer allows for
     undisturbed heat stratification in the tank. The coils automatically purge themselves of air on startup.

     Two sizes are available for space heating and conventional water heating: 120 and 180 feet.
     The 120 foot coil is rated at 26,400 Btu's with 120 Deg. F. average tank temperature. (Part No. 425)
     The180 foot coil is rated at 39,600 Btu's with 120 Deg. F. average tank temperature. (Part No. 427)

     The Btu output rating of these coils is based on a series of tests done by the Department of Engineering
     at Bucknell University. These are rated at the point at which the stored energy is technically depleted.

     b. For Solar Domestic Water Heating.

     The heat exchange coils for solar/domestic water heating were specifically designed as a stacked pair
     of coils, 22 inches in diameter and 43 inches high. The bottom coil is 90 feet long and is rated at
     22,000 Btu's. It is self-supporting and can stand alone on the bottom of the water storage tank. The
     solar-generated heat enters the top of the bottom coil and returns to the collector from the bottom of
     the coil. The position of the coil at the bottom of the tank assures the coolest tank temperature for the
     best solar results.

     The top coil is the domestic hot water take-out coil. It is located at the top of the tank where the water
     is the hottest. City or well water feeds the bottom of that coil and exits the top of the coil. (This solar
     coil is Part No. 424.)

4. TANK PORTS AND PENETRATIONS.

     Ports in two sizes are available for pass throughs above the water line; one for 3/4 inch copper pipe
     (Part No. 438) and one for 1 inch copper pipe (Part No. 439).

     For below the water line, two ports are available:
     1. An Open loop port with a 1 inch female threaded fitting. (Part No. 436)
     2. A 1 inch element flange port with a 1 inch female threaded fitting and octagon box. (Part No. 485)

     A solar return compression flange with one inch threaded fitting is located above the water line for an
     open loop drainback collector. (Part No. 436S)

     Each tank order must include the size and number of these ports.

5. "FIRESITE" TANKS FOR ON-SITE FIRE PROTECTION

     These tanks, like all other tanks manufactured by STSS CO INC, have an aluminum outer shell, two
     inches of insulation on the top, sides and bottom and are lined with EPDM. The Firesite tanks are built
     on the same concept as all other STSS water storage tanks. They are collapsed and crated in a
     narrow crate which can easily be moved through most doorways. They are light weight and easy to
     handle.

     Most important, the Firesite tanks are of high quality, they are durable and have a longer life
     expectancy than steel. Firesite tanks have been used by the fire protection industry for over ten years
     with outstanding performance.

     All Firesite tanks come with a suction vent cover with bug and rodent screen.

     There is one penetration above the water line. That is an overflow port.

     Below the water line there are two ports. One is for the 3/4 inch or one inch automatic float fill valve
     and one is the large suction port near the bottom of the tank. All orders must include the size of the
     float fill valve and large suction port required for the installation.

     Prices quoted include the 3/4" float fill valve and 2 inch or 4 inch pump suction ports sized according
     to the tank size. There is an additional price for the 1inch float fill valve. Refer to the price list for
     standard ports. Call STSS for prices on non-standard ports.

6. POTABLE WATER PROCESSING AND STORAGE

     The tanks designed for potable water storage have an aluminum outer shell, two inches of insulation
     on the top, sides and bottom and are lined with 40 mil white NSF PVC. This liner material is designed
     for drinking water applications. The size of the tank will determine the size of the openings into and out
     of the tank. These openings or ports will be specified when the order is placed.

7. STSS ENERGY MANAGEMENT CONTROL (EMC)

     This packaged control system automatically switches on the backup boiler when the heat storage tank
     is not warm enough to maintain room temperature. It isolates the fossil fuel system from the
     wood/solar/tank system and samples tank temperatures at the end of each boiler cycle. When the
     wood boiler is fired or the sun comes out, the system switches back automatically to the primary tank
     system thus using as little oil or gas as possible, yet getting every Btu available from the bank. This
     method improves solar collector efficiency and wood boiler efficiency.