The Green Power Company offer a range of domestic hot water systems, manufactured by world leading brands, to offer high efficiency, durability and value for money for our customers.
Depending on your requirements, we have the right hot water system for your needs and budget. Our domestic hot water systems include heat pumps, solar flat panel and evacuated tube systems. High and low pressure solar systems, roof and ground mounted tanks, instantaneous gas boosted and hydronics coupled boiler systems, aswell as wetback and water sleeve boosted applications.
Our brands include:
Installation of a Hot Water System
A hot water system should be installed close to the kitchen, bathroom and laundry facilities, in order to minimize the distance the hot water has to travel to get to the faucet. In some cases, you may require the installation of multiple tanks, or a centralized roof mounted tank, or even a hot water re-circulation loop, which maintains hot water at each faucet. Minimizing hot water lag will prevent the waste of water and energy, not to mention valuable time.
A solar collector array is designed to be installed facing as close to north as possible, at an incline close to 60 degrees from the horizontal plane. Roof mounted tanks must be a maximum of 250L and can be installed on tiled roofs with the additional of structural supports.
Straight electric element hot water system are very energy intensive and are now illegal to install. Electric Elements, generally 2400W or 3600W are to be used as boosters only.
Heat Pumps require a fan outlet ventilation space of 1.5m and should be installed outdoors, ideally with sunlight aspect in winter to maximize warmth. Heat pumps are most efficient when coupled with a solar PV system to suplement the required power.
Retrofitting an old electric hot water system or an in roof gravity tank system with a new type of hot water system may require considerable additional plumbing work, including a new pipe run, electrical work and draining and removal of your existing tank. Please consult with our professionals for further details.
Which Type and Size Hot Water System Should I Choose?
The Green Power Company recommend using the suns radiant heat to provide a bulk of the energy required for your hot water system. This can be done via solar collectors or a heat pump powered by solar PV. By using the suns energy, approximately 80% of the average homes hot water needs will be generated from the sun.
In mild climates, a 400L tank will cater for 4 -6 people, while a 250L tank will cater for up to 4 people. Each solar evacuated tube heats around 10L of water, and can be scaled up or down in quantity and arrays, if required.
Domestic Hot Water Heat Pumps require approximately 1KW of power to generate 4KW of hot water, and coupled with a solar pv array and storage tank, creates a very efficient system. Heat pumps are generally simpler to install than solar hot water systems and are a very good option if roof restrictions are present and/or gas boosting is not available.
For an off the grid home with a fire place, it is recommended to use a closed couple evacuated tube system with wetback or water sleeve boosting. This will eliminate mains supply, gas or electric backup requirements. Wood fuel boilers can also be used for hot water supply and home heating purposes, and can be coupled to a solar collector and storage tank for increased efficiency.
Instantaneous gas boosted hot water systems are cheap to install and reliable to operate and require minimum space. They can be coupled with and without tanks, however you will continue to pay for gas supply at increasing prices.
Prevention of Legionella Bacteria from entering the Water Supply
Legionella bacteria grows in warm water and can be potentially fatal if consumed. Hot water systems must be boosted to 70°C to prevent legionella growth. This can have a big impact on energy consumption, considering the water is then tempered down to under 55°C for use within the home.
To prevent the legionella issue, and avoid having to heat water to 70°C, we recommend using closed couple, low pressure systems. These systems act as instantaneous solar hot water systems, passing potable water through a closed couple copper loop heat exchanger which is embedded in a thermal hot water tank. If the thermal tank temperature requires boosting, then the thermostat can be set to around 45-50°C, without legionella risk, which will significantly increase efficiency in the colder months.
Gas instantaneous boosting also minimizes legionella risk by not requiring a heat storage tank. Gas instantaneous boilers are factory set at 70°C and should be reduced to around 50°C if not coupled to a storage tank, to increase efficiency.
All hot water supply is tempered down to reduce scalding at the tap.