ENERGY/HEATING


Enquiry Service: crownwood@btconnect.com Stop downloading and start streaming –


hot water on Pay As You Go STORING hot water can cost a lot more money than using on-demand heating appliances. The fuel bills can add up to seriously significant sums of money in fuel bills in light commercial sites such as schools catering, restaurants, retail outlets, leisure centres or any one of the numerous other possible applications. Stored hot water, because of the design of the systems, can find it difficult, to cope with demand, as the recovery times can be longer than the period of time in use. The length of time this type of product has been on the market – plus inertia due to technology recognition has ensured that the industry, especially the installer and the specifier, think hot water storage systems are a sustainable option. But like with the way we watch TV, movies and play games – eventually certain technology is ‘leapfrogged’ by more sustainable technologies compare real time base running costs for a continuous flow hot water heating system - all day every day, like for like in specific applications - with those for a stored system, they will find they can save between 25-30% in energy bills over the lifetime of that appliance. The only time a user pays for energy use is when there is a demand, in other words the system will only burn gas when a tap or shower is being run. Just like streaming movies or TV shows!


The end-user will be paying ‘as they go’- as opposed to paying for a store of hot water that has to be brought up to 60°C from cold and then constantly maintained at that temperature 24/7 even when it is not being used. When all the water is used up, cold water will be heated and then stored until it is needed - meaning continual standby losses and continued re-circulation via a pump around the building, creating losses – all so the store avoids stratification systems. Stored hot water systems are almost always designed to over-capacity because of the difficulty in sizing to any real accuracy. For example, how much store for peak loads? Estimated lengths of shower time per person? How many people? How much water? So systems are often oversized in compensation and they use too much gas and too much storage – wasted money. Rinnai recently completed a detailed study and report on a project to replace a fractioned storage system providing hot water only, no heating, for a school’s annexe kitchen. The kitchen was not in continual daily use and was shut over weekends.


A traditional storage system, which would have to heat and store water until it is needed, incurs cost and wastes valuable resources. But a continuous flow system would have no energy costs unless the units


More information


E: info@rinnaiuk.com W: www.rinnaiuk.com T: 01928 531870


Enquiry Service: enquiries@cwponline.co.uk


are being used – in other words, someone turns the tap ON and the water is heated. The water has not been stored (and paid to be stored). A detailed plan showed costs on a like-for-like use would give payback for a continuous flow condensing unit system in a fraction over two years simply because of slashed running costs. The model illustrates that payback would be even sooner as in reality the system would actually use less gas.


And continuous flow systems have many other significant advantages over stored. A condensing continuous flow water heater guarantees a constant flow of safe hot water at a precise temperature.


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