Water heating
Combined solution for office block
When a 5-storey office block in Gosforth, Newcastle was looking for a reliable way to provide hot water without access to gas, GasTech provided the solution with an electric boiler and fast recovery cylinder combination from ACV UK
www.heatingandventilating.net
T
he Regents Centre office block was previously using a hot water cylinder and inefficient immersion heaters to supply hot
water to 200 outlets, including toilets, showers, basins, and kitchenettes. Due to the demand placed on the system the immersion elements couldn’t handle the work and kept burning out. To evaluate the requirements of the building,
Craig Firth, director at GasTech – a growing business for HVAC design, installation, service and repair – visited the site and offered a solution using ACV products. Mr Firth commented: “The plant room had no
access to natural gas, so we wanted to explore all the options to overcome the client’s problems. We did look at running gas to the plant room but that was quite cost prohibitive, so an electric boiler seemed like the ideal solution.” GasTech are approved ACV engineers and have
worked with ACV products for many years. Mr Firth went on to say: “ACV is a brand we trust and we’re familiar with their product range. There aren’t many electric boilers on the market suitable for commercial applications, so being able to choose one from a company we know suited us.” The chosen system consisted of an ACV E-tech
36kW three phase electric wall hung boiler providing the heat to a Smart 600 litre tank-in-tank calorifier. With continuous flow rates at 45ºC of 2,152 l/h the tank-in-tank design of the calorifier can provide fast heat up and quick recovery to meet
28 April 2023
all the hot water requirements of the offices. Tank-in-Tank technology from ACV is a domestic
hot water storage exchanger, which is completely immersed in a steel outer tank that contains primary water. Manufactured of stainless steel, the wall of the inner tank acts as a heat exchanger between the primary circuit, which is connected to the boiler, and the DHW storage tank. Due to the large surface area for increased heat transfer and high storage temperature of the tank-in-tank
system, the volume of water can be significantly reduced, which in turn, helps to cut costs and direct emissions.
Using their experience and knowledge to assist in the product specification and system design, ACV provided the DHW calculation for the building demands. Mr Firth continued: “This was a simple and
straight forward installation to complete as there were no flues or gas pipes to be connected. The products are performing as expected and the system is much more efficient than the previous one. The client is very happy with the project. ACV manufacture reliable products that are easy to use, with easy controls to setup, and good backup from their teams.” The client will also benefit from reduced ongoing
costs and maintenance as the tanks require no anode protection due to being constructed from corrosion resistant stainless steel. The tank-in-tank design reduces scale build up and legionella risk as the hot water is stored at higher temperatures, above 60ºC. The electric boiler is also less complex with fewer components compared to gas so will save time and money in servicing. With electricity becoming a popular and more sustainable way to provide heat and hot water, particularly for sites with no access to gas, ACV offer more than 13 electric boiler models from 14- 259kW output, single and three phase options as well as combined heating and hot water models.
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