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I have a JMB white light full aperture solar filter for my 12" Lx200.
It certainly does not allow any heat to pass throught to the optics and when the seeing is absolutely perfect gives incredable views of the Sun.
Having said that my 4" Genesis with a Baader filter gives as good a result 95% of the time!! It all comes down to the local seeing conditions.
(You can wrap the OTA etc in aluminium foil to reduce the ambient heating...but it's still at the mercy of the conditions at the time.)
I also do Ha imaging with a SM60 and 88mm modded PST; the SM60 is very good, but under the right conditions the 88mm gives much better detail - aperture still is king!
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