Continuous Flow Water Heaters
Bosch continuous flow water heaters provide a constant source of hot water. Since the water is heated when required, they never run out of hot water. Additionally, their output is bigger compared to their physical size and are more space efficient that the storage tanks.
It is also instrumental that these types of water heaters can run on electricity, LPG, or natural gas. The gas versions are suitable for both external and internal installation, while the models that operate on electricity are designed for internal installation only. Both the electric and the gas models have precise temperature controls and can be supplied as 50°C temperature models.
Newer models of continuous flow water heaters that operate on gas are room sealed appliances that use a co-axial flue system to supply combustion air and remove combustion products. They are therefore very safe with regard to the exclusion of flue gasses from the living environments. For markets such as Europe, the design standard is installing compact gas room sealed appliances in laundries or kitchens, either directly on the walls or concealed in the cupboards.
Gas Continuous Flow Water Heaters
Gas continuous flow water heaters are efficient in terms of space whether they are installed externally or internally. However, with outside installation, it is important to consider Worksafe requirements as well as access to the appliance during servicing.
It is common to install external gas continuous flow water heaters on the upper story balconies. But this may pose aesthetic challenges, especially when extra flue diverter devices are considered so as to comply with the AS5601 standard on deflection of flue gasses.
In addition, in NSW, the NSW Fair Trading Department has strict regulations on any gas water heater on a balcony that has a roof and enclosed on more than 2 sides.
As already stated, the electric continuous flow water heater systems are designed for internal models. The basic models are installed under bench while the units that have control features are hang on a wall. The electric models are limited on energy input (the volume of water they can heat). There are single phase models, and 3-phase models. The cost of operation is usually higher than gas models.
Storage Water Heaters (Tank Systems)
The tank systems water heaters are designed to generate domestic hot water in conjunction with a hot water unit using hot water circulation. The tank is not intended for use in pool heating applications or for heating any liquid other than water. It is also not intended for use in gravity hot water heating systems.
Tank volume directly affects the amount of hot water available from storage tank water heaters. Since the average person uses about 50 litres of hot water per day, a larger storage tank will be required when more people live in a given household. However, this requires more space and can reduce the available space in the house. Moreover, many buyers now dislike the traditional design solution of fitting storage tanks into the bedroom wardrobes.
A storage tank also compromises convenience and comfort. This is because the recovery time required to re-heat an empty storage tank depends on volume which is measured in hours. Furthermore, storage systems require mandatory fittings as well as the extra cost of a tempering valve. The tempering valve is required by the Plumbing Code of Australia. It limits the maximum outlet water temperature to 50°C to sanitary outlets to minimise the risk of scalding.
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