Welcome to Rogee Hydronics. We design and install solar thermal hot water heating systems for radiant hydronic heating and domestic distribution applications.

What is Solar thermal energy?


What is solar energy? Solar energy is the radiant energy produced by the Sun. It is both light and heat. It, along with secondary solar-powered resources such as wind and wave power, account for the majority of the renewable energy on Earth.

The Earth receives 174 petawatts (PW) of solar radiation at the upper atmosphere. 30% of that is reflected back to space and the rest is absorbed by clouds, oceans and land masses. Land surfaces, oceans, and atmosphere absorb solar radiation, which increases their temperature. Warm air containing evaporated water from the oceans rises, causing convection. When the air reaches a high altitude, where the temperature is low, water vapor condenses into clouds and causes rain. The latent heat of water condensation increases convection, producing wind. Energy absorbed by the oceans and land masses keeps the surface at an average temperature of 14°C. Green plants convert solar energy into chemical energy through photosynthesis. Our food supply is completely dependent on solar energy. After plants die, they decay in the Earth, so solar energy can be said to provide the biomass that has created the fossil fuels that we are dependent on.

Humans harness solar energy in many different ways: space heating and cooling, the production of potable water by distillation, disinfection, lighting, hot water, and cooking. The applications for solar energy are only limited by human ingenuity. Solar technologies are characterized as either passive or active depending on the way the energy is captured, converted, and distributed. Active solar techniques use photovoltaic panels and solar thermal collectors to harness the energy. Passive techniques include orienting a building to the Sun, selecting materials with thermal mass properties, and using materials with light dispersing properties.

Our current dependence on fossil fuels is slowly being replaced by alternative energies. Some are fuels that may eventually become useless, but solar energy will never be obsolete, controlled by foreign powers, or run out. Even when the Sun uses up its hydrogen, it will produce useable energy until it explodes. The challenge facing humans is to capture that energy instead of taking the easiest way out by using fossil fuels.

Solar thermal energy (STE) is a technology for harnessing solar energy for thermal energy (heat). Solar thermal collectors are classified by the USA Energy Information Administration as low-, medium-, or high-temperature collectors. Low temperature collectors are flat plates generally used to heat swimming pools. Medium-temperature collectors are also usually flat plates but are used for heating water or air for residential and commercial use. High temperature collectors concentrate sunlight using mirrors or lenses and are generally used for electric power production. STE is different from photovoltaics, which converts solar energy directly into electricity.

Solar Thermal Radiant Heating Systems/Domestic Water Heating For Your




Rogee Hydronics uses a solar hot water (or thermal) system to heat your home. The solar hot water system can be connected to a radiant floor and/or wall panel radiator and or your domestic water. We can make collection and distribution system as simple or complicated as necessary depending on your location, climate, and intended use. Most radiant heating systems use the collection array to heat water and store it in a large thermal collection tank so that you have enough heat to last at least throughout the night. A general rule of thumb is to have a collection tank that can store 1 and a half to 2 gallons of water for every square foot of solar collector. The heated water, is piped via plastic tubing under floors to create an effective heating system. Radiant floor heating systems have many advantages. They are typically 40% more efficient than a forced air heating system and can be zoned to control heat in individual rooms. Radiant floors distribute heat beneath your fee where it naturally rises providing a cozy and evenly distributed heated living space.

Solar Thermal Domestic Water Heating For Your Home

Solar Water Heaters

Solar water heaters - also called solar domestic hot water systems - can be a cost-effective way to generate hot water for your home. They can be used in any climate, and the fuel they use - sunshine - is free.

How They Work


Solar water heating systems include storage tanks and solar collectors. There are two types of solar water heating systems: active, which have circulating pumps and controls, and passive, which don't. Most solar water heaters require a well-insulated storage tank. Solar storage tanks have an additional outlet and inlet connected to and from the collector. In two-tank systems, the solar water heater preheats water before it enters the conventional water heater. In one-tank systems, the back-up heater is combined with the solar storage in one tank.


Rebates and Incentives

For more information on solar and other tax credits:

Federal Tax Credit:
www.energystar.gov/taxcredits and complete Corporate Tax Credit Form 3468 and consult a tax professional for further details.

State and Local Tax Credit:
To determine what rebates are available in your state, go to 
www.dsireusa.org. This link will direct you to the Database of State Incentives for Renewables and Efficiency (DSIRE).





Solar Thermal

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