Hot and Cold Water Services

It is well documented that legionella can be a killer disease. It can live and multiply in water at temperatures of 20ºC to 45ºC. Hot water must be circulated within close proximity of the outlet at a temperature of 50ºC to 60ºC to help prevent legionella developing.

Due to this in many circumstances, particularly applications such as nursing homes, schools and public buildings, the installation of blending valves at each outlet would be required to reduce the temperature of the discharged hot water to approximately 42ºC to prevent scalding.

These types of blending valves could be anti-tamper so that once they are set to the desired temperature unauthorised adjustment could not be carried out thereby ensuring a continuous safe temperature at the outlet.

Multipoint Self Venting Cistern Type

Where break tank installation is impractical this type of heater has an integral cistern and can supply a number of hot water outlets. They are available in a range of capacities from 25 litres to 125 litres.

Multipoint Unvented Water Heaters

This type of water heater can be connected straight to the cold mains. The advantage of this type of heater is that higher pressure and flow rates can be available at all taps and balanced hot and cold water at outlets subject to the available mains pressure. Heaters with 10-15 litres capacity would be adequate for 3 to 4 wash hand basins, however a 50 litre would be required to supply 7 to 8 basins. They are suitable for use with standard or mixer taps.

Multipoint Instantaneous Water Heaters

A gas fired instantaneous water heater will give a continuous supply of hot water on demand. This type of water heater eliminates the need for a water storage cylinder. It can be connected to a number of outlets and could be used for hot water washing, mixer showers, hot fill domestic appliances in kitchens and canteens.

Plate Heat Exchangers

Packaged plate heat exchangers can fulfil a tremendous variety of applications from domestic hot water generation for hospitals, hotels, apartment blocks and offices to swimming pool heating or even complex process heating. These packaged systems can be supplied complete with primary pumps, 3 or 4 port fast acting motorised control valves on the primary circuit and a controller for sensing the secondary water temperature and motorised valve control. Steam to water packages can also be used if required.

The heat exchanger is constructed from a number of gasketed stainless steel plates easily increased should demand require it. Their low water content and temperature rise of 10ºC to 60ºC in a split second means that there is no legionella potential. Ideal for use in conjunction with condensing boilers as lower primary temperatures can be used thus creating condensing modes of boilers and achieving maximum efficiencies.

Gas Fired Storage Water Heaters

In commercial and industrial properties gas fired storage water heaters are a common and effective method of supplying hot water. Manufacturers have designed heaters with fairly low storage capacity but with extremely fast recovery times. Custom designed baffles are installed in the flue ways which increase the amount of heat transfer from the flue gases. This action helps to obtain the fast recovery of hot water.

The products of combustion are then passed through a draught diverter and flueing arrangement to atmosphere. Fan assisted balanced flue models are widely available to suit the majority of applications. For additional operating control and efficiency these heaters offer fully automatic ignition without a permanent pilot.

We can offer advice on specific applications to ensure that the most appropriate method is used to suit our clients’ needs.