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Hi, My rads are 20yrs old & the TVRs the same. I'm replacing a couple of the rads (nothing wrong with them, just moving things around a bit). Should I replace the TVRs, or can I reuse the old (Honeywell) ones? Why does the price differ so much with these things? Ones made by known...

Cheers John, I think that answers my question. I'm sure I'll regret asking, but how do you work out the actual heat losses, etc. Would like to know if it's financialy worth doing, or if it's going to take 50 years to pay for it's self!

I've got 2"x2" studwork up on a wall ready to dryline, but what's the best way forward? I was going to use Rockwall slab insulation and foil backed plasterboard. Or, should I use kingspan? This seems a more expensive option, but would it give significant benefit? Sorry, R values, U values and...