orrectly sizing a water heater is vital for ensuring that the end-user has a constant supply of hot water throughout the day. Failing to size the water heater according to the needs and demands of those making use of it can lead to a lack of hot water, or too much hot water being heated at any one time, a challenge for those cost-conscious end-users. Specifying the right sized water heater for the job at hand, whether it’s a new or replacement water heater, is therefore crucial to ensuring that a customer’s needs are met.


Fing the correctly sized gas fired water heater for the job at hand is crucial for complying with the latest UK legislaon on eciency and emissions and ensuring that it can meet the hot water demands of the enduser. Gemma Kilburn at Andrews Water Heaters explains why, when fing a new or replacement water heater, the size of the appliance maers, and outlines the potenal

consequences of under– or over–sizing

uA hotel with hundreds of guests will need a hot water heater that can cope with the demands placed on it

Understanding peak demands

With the cost of heating water in commercial premises a pressing concern for businesses, ensuring that costs are kept low is important when specifying water heaters. Specifying a model that is larger than that required by the business can result in higher energy costs due to heating water which is surplus to requirements. A water heater that is too large can also result in excess financial costs, both upfront investment in the cylinder and the longer-term operating costs. It is the role of the specifier to understand the peak demands of the property. For instance, if the property requiring a new or replacement water heater is a hotel, then understanding the hours when customers are likely to most need hot water will play a role in the solution that is specified. According to the Hot Water Association the average bath uses 100 litres of hot water at 40˚C, while the average shower uses 18 litres of hot water per minute, a hotel with hundreds of guests will need a hot water heater that can cope with the demands placed on it by guests. However, these figures will vary depending on the habits of the end-user. Therefore, specifying a water heater should not be a guessing game, but rather should be informed by the information provided by the building manager.

Sizing considerations

With this water usage in mind, a four-star hotel that has high guest expectations and a perceived reputation to uphold,

will require constant hot water. With the hotel accommodating 200 guests for instance, and requiring hot water for a peak period of 120 minutes, it would need a hot water heater such as the MAXXflo which can provide a

recovery rate of up to 1920 litres through 50˚C t to satisfy the expectations and demands of hotel guests. Whereas, a four- star hotel that can accommodate 300 guests at any one time, and requiring hot water for a peak period of 120 minutes would better suit the SUPAflo EVO. This has a

recovery rate of up to 9230 litres at 50˚C t to satisfy the increased hot water requirements.

Now imagine for a moment that a water heater designed for continuous supply of hot water to 100 guests is specified for a hotel serving many hundreds of guests. The likelihood is that many customers will be unable to begin their day with a hot shower as the smaller cylinder will be unable to cope with the increased demand. Specifying correctly at the point of design or replacement is therefore pivotal to ensure that the end-users needs are catered for.

Several key considerations to make when sizing a gas-fired water heater include:

uPeriods of peak hot water demand. uBusiness operating hours (if applicable). uThe number of residents in a residential building (if applicable).

uThe number of fixtures – including showers, baths, sinks and pools.

uPhysical footprint of the cylinder. Energy saving

With energy-efficiency playing a greater role in the purchasing decisions of businesses, having too much hot water is now just as big a challenge for a hotel or salon as having not enough hot water. Reducing waste and cutting inefficiencies are now a primary concern and with a diverse range of products being readily available on the market, there is no excuse for over– or under–sizing a hot water heater.

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9 

9  

9  

9 

9  

9  

  

Read the latest at:

BSEE Why the size of a water heater matters

uSupaflo condensing water heaters from Andrews

With the cost of heang water in commercial premises a pressing concern for businesses, ensuring that costs are kept low is important when specifying water heaters



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