Tag Archive for: limescale

Extra Gains For Net Zero Restaurants

Commercial hot water specialist Adveco is working in partnership with a global restaurant brand to support the rollout of net zero restaurants demonstrating low emission innovations throughout its chain of UK drive-through and high street franchises.

Through its programme of live metering, Adveco demonstrated that servicing domestic hot water (DHW) water demands of between 1200-1500 litres per day could equate to as much as 20% of total energy usage within the organisation’s target net zero restaurants. A recent refurbishment of a restaurant in the King’s Cross area of London provided an opportunity to address the emissions generated by this provision of hot water for the restaurant. In addition, working within existing building limits means applications need to maximise often limited plant room space. This was especially true of this central London location which also faced problems with limescale due to the hardness of the water supply.

Working to an all-electric specification, Adveco designed an application that would harness a 9kW FPi32 air source heat pump (ASHP) for preheat and supplying additional top-up heat with an ARDENT P 12kW electric boiler. These would supply thermal energy to a mains water-fed compact SST500 stainless steel twin-coil indirect cylinder.

By combining ASHP and an electric boiler Adveco can address many of the complexities associated with integrating ASHPs into existing buildings. This combination enables systems to be sized down, by as much as half in terms of ASHP requirements delivering immediate capital savings as electric boilers are far less expensive compared to an equivalent heat pump. You also immediately reduce the physical size of the system, embodied carbon and demand from the electric supply. Additionally, the system retains redundancy should there ever be a failure.

Balancing a hybrid electric system is key to ensuring efficient operation. Adveco supplied the controls to assure the water heating remains consistent, optimising the ASHP preheat and top-up from the boiler to reduce energy demands and the building’s emissions.

The other advantage of incorporating the ARDENT electric boiler was that it heats water using immersion heaters located in a small tank within the boiler housing rather than directly installed into the hot water tank. This creates a sealed ‘primary’ loop to the indirect coil in the SST500 cylinder. The electric boiler heats the same water continuously so there is only a small, finite amount of scale in the system which will not damage the elements. The heat exchanger in the cylinder is a large coil operating at a relatively low (80°C) temperature eliminating the common problems of destructive limescale build-up seen in direct immersion electric heating.

The electric boiler operates at the same efficiency as an electric immersion heater (100%) and so the only overall difference in system efficiency is the minimal pump electrical consumption and a negligible amount of heat loss in the pipework

Although the system takes up a little more space than an all-in-one electric cylinder, it has more versatility. It requires less clearance for the cylinder, so it was compact enough to fit into the extremely limited space allowed for plant in the restaurant. With the cylinder forming significantly less scale, the restaurant has gained from vastly improved reliability while reducing maintenance demands, for both operational and maintenance savings on top of crucial emission reductions.

Visit the Adveco restaurant resource for more guidance on delivering low carbon and renewables to help achieve net zero restaurants by 2050, or read our free handbook. 

Adveco ARDENT Electric Boilers For Commercial Hot Water

  • A range of compact wall-mounted and floor-standing electric boilers from 12 – 100 kW
  • Provides high-temperature top-up for heat pumps systems
  • Counters limescale production in hard water areas as part of an indirect DHW system

Commercial hot water specialist Adveco, announces the range of commercial ARDENT electric boilers. Encompassing wall-hung and floor-standing variants with heat outputs from 12 to 100 kW, ARDENT provides an easy-to-integrate, high capacity, reliable, and compact response for electric hot water and central heating demands in commercial buildings.

“Designed to serve an indirect water heater or heating system, multiple electric heating elements immersed into ARDENT’s integrated water storage tank provide a rapid and reliable source of thermal energy for those seeking to avoid a reliance on gas energy supplies,” said Bill Sinclair, technical director, Adveco. “ARDENT can be combined with heat pump systems to provide a high-temperature energy source during the coldest months, or, as part of an indirect hot water system, can help eliminate damaging scale build-up commonly seen on direct electrical immersion heaters.”

The front-mounted controller with an LCD display provides intuitive control. With stepped power control and integrated overheat protection, ARDENT reduces start-up current and provides optimum heating output. ARDENT economically adjusts the heating load when approaching the set point temperature and range rating to tailor the boiler power to suit the application and reduce wear on the heating elements.

The compact wall-hung ARDENT is available in two ranges, ADRENT Standard and ARDENT Plus, offering outputs from 12 to 36 kW with multiple heating elements that provide built-in redundancy.

The ARDENT Standard 24 kW and 36 kW models feature one to three heating elements with thermostat input and output control to an external pump.

The ARDENT Plus 9 kW, 12kW and 24 kW models feature six to nine heating elements a front-mounted controller with LCD display, and as well as an integrated expansion vessel, relief valve, and circulation pump. Additional controls for a 3-port valve and fault output are also included.

For larger-scale applications, ARDENT electric boilers are also available as a floor-standing appliances with 60 kW, 80 kW and 100 kW heat outputs. Stepped element control is included, as well as an automatic air relief valve, safety valve, and temperature and pressure sensors. The integral controller boasts an LCD display and fault output.

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Additional Information

  • Wall-mounted ARDENT S & P has a protective IP40-rated outer shell. ARDENT floor standing models are rated IP20.