Dryer recall

My (b class) tumble dryer is subject to a recall. They are offering a c class as a replacement. With current energy prices, I'm worried this will cost more to run. 
So my questions are... 
1. Is there much difference in cost of running the B class vs C class? 
2. Should I just be grateful I'm going to get a replacement, or should I try and insist on a B class replacement?


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