Anybody familiar with Thermoboost?
My son had a new boiler fitted, and the guy was singing the praises. He said it worked by lowering the specific heat of the water, and had seen a test where equal volumes of water and water + additive were heated at same rate. The one with got to 33°C, while the water only reached 25°. Then when taken off the heat, the water cooled to 20°, while the other only cooled to 30°. (that was odd for a start, I expected him to say the one with additive cooled quicker, as you’d expect if the heat capacity was lower). He said it saves 30% on heating costs.
I found the website http://thermoboost.com/ , it claims 20% saving, but says nothing about how the stuff is supposed to work. I don’t think it’s possible to alter the specific heat of water by an additive. If the additive has lower specific heat it would reduce that of the mixture, but only in proportion, and as the dose rate is 1% of system volume it makes negligible difference even if specific heat of additive is zero. With lower specific heat the liquid would warm up quicker, but also cool quicker, so even if it’s true, it’s not clear to me how it would improve system efficiency.
You can only get out of the rads the heat that goes in from the fuel, and since modern boilers are >90% efficiency saving 20% looks unlikely to say the least. If some of the rads are blocked with sludge maybe the house isn’t heated adequately, but provided the boiler is OK the cost per BTU or kJ into the rooms doesn’t change. The total cost could be lower, but with a cooler house.
So all-in-all I’m sceptical, but interested in others’ comments.
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