Water heating Efficiency
Above left: ECOflos and solar thermal cylinders, from Andrews Water Heaters; and right: EcoForce wall-hung condensing water heaters and steel storage vessels from Lochinvar.
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tariff is rather meagre and we would also have liked to see more support for larger combined heat and power systems,’ he says. ‘However, the principle is good and, hopefully, the
Renewable Heat Incentive (RHI), when it comes in next year, will start to make investment in a range of renewable and low carbon heating technologies more attractive to end users. Currently, we get less than one per cent of our heat from renewable sources and that really must be improved quickly.’ The integration of renewable technologies with
Currently, we
get less than one per cent of our heat from renewable sources and that really must be improved
quickly – David Dutch
traditional water heating technologies is a critical issue for David Pepper, managing director of Lochinvar: ‘There has been a clamour for using renewable technologies for providing heating and hot water services in buildings. As far as hot water is concerned, solar seems to be the most popular. ‘Because it is in the news, everybody concentrates on the solar aspect, but in actual fact it is still the secondary
provider in terms of energy. I can see a lot of people thinking that solar will answer all their problems and it is not necessarily the case; the main part of the hot water system has got to be right as well.’ Pepper believes we could help reduce carbon
emissions with a stronger emphasis on reducing the use of fossil fuels rather than making ‘unrealistic attempts’ to replace it with renewable technologies ‘because the technology is not there to provide much more than 25-30 per cent in commercial buildings’. Nonetheless, renewables are becoming increasingly
important as pressure grows to save energy and cut emissions. And, says Hughes, this increase in technology has
implications for the education of consultants: ‘There is going to be a big requirement for knowledge and many people are going to have to do an awful lot of swotting up, not because it’s more difficult but because there is much more data available to them.’ l
UK market Cylinders still dominate hot water use
Vented or traditional cylinders have been the most popular units on the UK market for a long time, according to research body BSRIA. That’s if you exclude sales of electric shower units (see table, right). However, this market has been declining by
about 10 per cent a year in recent years, partly due to increasing sales of combination boilers. Sales of traditional cylinders go mainly to the
replacement market, with the new-build sector oriented towards unvented storage systems – with cylinders for solar thermal and heat pump installations having particularly good prospects in the years to come. Cylinders are overwhelmingly used in
residential heating systems in the UK, therefore the use of electric storage water heaters is very much restricted to the sector. Units below 15 litres storage capacity are the most popular.
Forecasts for UK water heating, volume (’000 units), 2009-2012
Gas instantaneous Gas storage
TOTAL GAS
Electric instantaneous Electric storage <15 litres Electric storage > 15 litres Electric boiling appliances
TOTAL ELECTRIC
(excluding electric showers)
Traditional cylinders Unvented storage
Other mains pressurised
TOTAL CYLINDERS
Source: BSRIA
2009 2010 2011 2012
36.1 37.0 38.9 40.8
8.8
9.0 8.6 8.5
45.1 45.8 47.5 49.3 127.7 126.4 126.3 126.3 152.0 146.7 145.2 148.1 10.6 9.9 9.5 9.1 49.6 48.6 48.1 48.0
339.9 331.6 329.1 331.5
443.2 412.2 383.3 356.5 265.1 246.6 234.2 227.2 65.0 61.7 58.6 55.7 773.3 720.5 676.1 639.4
66
CIBSE Journal April 2010
www.cibsejournal.com
Andrews Water Heaters
Lochinvar
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