51 HPM 0413

HPM April 2013

RENEWABLEENERGIES Vokera’s Unica i28: top marks all round Although Vokera has only unveiled its Unica i range of combi boilers this month, HPM has already been given exclusive access to a step-by-step installation of the Unica i28 model. Editor Tim Wood reports… The property for the new installation was chosen as the current boiler - a seven-year-old combi - was on its last legs. Although the appropriate size for the property, the boiler had become very noisy and was displaying a number of faults to do with its pressure, its fan and its heating mode. The new owner was also keen to cut his bills and wanted a quick and easy job. Step forward the Unica i28. One of three outputs available in the range, it is said to have impressive green credentials for energy conscious homeowners and designed with ease of installation in mind. This was particularly important with this particular switchover as the boiler was being moved from a second floor bedroom to a loft. The Unica i28 is packed with plenty of features to maximise energy savings. A modulation ratio of 10:1 improves energy efficiency by reducing the frequency of on/off cycling, while also minimising unnecessary wear and tear on boiler components and ensuring a stable domestic hot water flow temperature. To further improve the Unica i28’s green credentials, it incorporates intelligent energy Step three: The Unica is hung on the wall having been carried upstairs saving software such as weather compensation and OpenTherm boiler modulation. The Unica i28 has many other selling points for homeowners. A large domestic hot water heat exchanger ensures the fast delivery of hot water, while the inclusion of a domestic hot water flow meter allows for greater temperature stability to maximise end user comfort. The Unica i range also boasts an LCD backlit display to improve the boiler’s user interface panel, plus a five-year warranty. The new Unica i range is very installer-friendly too. Installation is made simple and straightforward with a rear flue option on all outputs and a newly designed fixing jig that can be removed once the pipework has been fabricated. Martin Westbrook, of Westbrook Gas Services, was tasked with fitting the Unica i28 - so what was his overall impression of the product itself? Martin said: “I like the good access to all the stats, thermisters and flow switches, while access to the pump is also pretty straightforward. There is clear access to a lot of the components, while there are not too many pull pin type fittings to make it quick and easy to get to other things at the back of the boiler.” Martin continued: “I also like the fact that we don’t have to go anywhere near the PCB and that clips, not screws, are used making access to the combustion chamber easy. “I like the easy accessibility of the drop down facia. There is clear underside access to all the valves and they all screw up. And you have the plug and play OpenTherm seven-day remote RF transmitter which is a real bonus. This is really smart thinking, dead cool. You put in on the wall, plug it in to the bottom of the boiler and off you go.” Vokera claims that the compact dimensions of the boiler (780mm x 400mm x 358mm) and weight (40kg) make lifting and siting easy. Martin agreed. “It is an easy liftable one man job, which was vital on this occasion as it was moved from a second floor to the loft on a ladder.” And the overall verdict: “The Unica i28 has got all the things in the right place. I’m not a lover of the new compact designs as I like to be able to get my hands in without any risk of slicing myself to pieces. But there is no danger of that here. This is a great boiler and I give it top marks all round.” 50 APRIL 2013 HEATING & PLUMBING MONTHLY WWW.HPMMAG.COM Got a story? Ring us on 01732 748041 or e-mail twood@unity-media.com Step five: The vertical flue is fitted Step six: The boiler is commissioned... Step seven: ...Martin takes a closer look Step eight: The Unica is fitted enquiry number 138 Step one: The boiler being replaced Step four: The boiler’s interior is Step two: The old boiler is removed inspected for ease of access


HPM April 2013
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