The more I look the more I want to cry. Take the example running cost here for example....
http://www.economy-radiator.com/images/pdfs/Example%20running%20costs%200710%201...The table appears to show impressive savings over a gas boiler but for starters their units are wrong. There is no such unit as a kw/day. They mean kwh/day.
Then notice that they claim a gas boiler needs 103 kwh/day to heep the house warm compared to only 32 kwh/day when using their product. Why? It's the same house at the same temperature isn't it?
Apparently not....
Look at the graphs. The temperature data for their product shows a remarkable stable temperature close to the ideal 21C.
If you look at the graph for the gas boiler (wet) it appears to show the room temperature varying between about 25 and 28C. Hard to tell from their graph but it seem to be much hotter than 21C. No wonder the bills were higher with gas - the room stat appears to be set too high or perhaps it's faulty
I suspect even that isn't enough to explain the huge difference in energy consumption. Perhaps they are also assuming a very old very inefficient gas boiler that hasn't been serviced for years?
They also assume electricity is £0.073 /kwh gas is £0.038 /kwh which is a ratio of 1.92 : 1. Notts say Electricty is currently £0.1295 /kwh and mains gas £0.0368 /kwh. That's a ratio of 3.5 : 1 so at best their figures are very out of date and by chance that favours electricity in the cost comparison.
I'd also like to know why they say a storage heater produces "dry heat (bad for asthma)" whereas presumably their product doesn't? How does that work exactly? I've never seen a storage heater with a little reservoir that had to be emptied. Where does the water go?
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economy radiators (Read 12051 times)
