Solar Thermal

Hot Water From the Sun! 

Sunlight remains an inexhaustible energy source. Sustaining the environment, it is available to all and very importantly, it costs nothing. Solar radiation means heat and is one of the best known forms of renewable energy - free, plentiful in supply and available throughout the year. This kind of energy can be effectively harvested by the installation of solar thermal technology.

How Does it Work?

Solar Thermal

Solar Thermal technology is a clean, safe and highly effective means of utilising renewable energy from the sun to warm domestic hot water. The basic principle is very simple:
If you unroll a garden hose on the ground and leave it exposed to the radiant heat of the sun, in a short time the water in the hose will become warm. Solar thermal collectors work in very much the same way but much more efficiently.
Usually, but not exclusively, roof-mounted solar collectors will be connected to one of the coils of a twin-coil cylinder, using a sealed circuit containing a special antifreeze mix - typically a glycol/water solution. This fluid not only withstands the high temperatures of a summer day, but also will not freeze in temperatures down to -25oC. The fluid in the collectors is exposed to and heated by the sun's energy, then this hot fluid is pumped through the system to the hot water tank. Most conventional boilers, combi-boilers and hot water cylinder systems are compatible with solar water heating, so there's no problem.

Evacuated tube collector

Choosing the Right Solar Thermal Collector          

There are two types of collectors used for solar water heating applications: Flat Plate Collectors and Evacuated Tube Collectors.

Flat Plate Collectors can be described most simply as plates of heat-absorbent material to be mounted in a sunny spot. The collector absorbs heat from the sun and then transfers that heat into the fluid circulating around the system.

Evacuated Tube Collectors are panels combining individual tubes with fluid circulating through them, absorbing the sun's heat.
For increased efficiency, Evacuated Tube Collectors feature a highly reflective, weather-proof CPC (Compound Parabolic Concentrator) reflector, fitted behind each evacuated tube. The special, geometric design of the reflector ensures that both direct and diffused sunlight falls onto the absorber even when the angle of the sun is sometimes not ideal. (See image above)

This considerably improves the energy yield.

Is Solar Thermal Suitable for My Home?

There is a common misconception that solar energy systems can work only in conditions of bright sunshine with high temperatures and are therefore unsuited to the British climate. Many believe that solar panels work only in the summer months. However, this type of free energy is available throughout the year. Our recommended solar thermal systems function in any sort of light conditions. They will perform best on cloudless, bright, sunny days, but will also achieve near optimal standards in diffuse or overcast conditions.

Each system uses a heat collector, mounted on the roof in a south-facing direction so that the heat-transfer fluid is heated by the sun. During the summer it can raise the temperature of water to boiling point and so has temperature-limiting features built in to prevent this. During the winter the system naturally performs to a lesser degree due to the reduced available sunlight. Nevertheless, the contribution from solar thermal can still be substantial, ensuring significant savings on your winter fuel bills. Remember, the energy required to raise a body of water from 1ºC to 2 ºC is the same as raising it from 99 ºC to 100 ºC.


The Benefits of Solar Thermal Water Heating

  • Enjoy Hot Water Throughout the Year: The system works all year round, though you'll need to heat the water further with a boiler or immersion heater during the winter months.

  • Cut Your Carbon Footprint: Solar thermal is a green, renewable heating system and can reduce your CO2(carbon dioxide) emissions.

  • Receive Money, (normally tax-exempt for domestic owner-occupiers), From the RHPP (Renewable Heat Premium Payment) & RHI (Renewable Heat Incentive) Schemes With MCS Certified System: See below.

  • Cut Your Bills: Sunlight is free, so once you've paid for the initial installation your hot water costs will be significantly reduced thereafter.

  • Reduce Your Dependence on Fossil Fuels: A solar thermal system can provide up to 70% of a property's domestic hot water requirements throughout a full year, though it's more efficient in the summer months.

  • Future-Proof Your Energy Costs: Not only will you experience a reduction in your current bills but solar thermal can also minimise the impact of inevitable energy price rises over the coming years.

  • Improve Your Home: An approved, energy-saving feature can add value and market appeal to your property.

  • Be Assured of Performance & Reliability: Average system lifespan of over 25 years with minimum maintenance required; warranty between 10-25 years.


If you have any enquires or require any additional information please do not hesitate to call our Energy Team on

01782 550371

Contact Broad Oak about Solar Thermal

Call Broad Oak during office hours on 01782 550371 or fill in the form below to get in touch.