Can any one recommend a brand of heaters?

Cecil

Pure Polaris heated grips/thumb warmer were pretty good kits,installed quite a few,plus also Kimpex made a good one. Both were similar in cost. https://www.kimpex.com/en-us/product...umb-warmer-kit

Can you wire both into the same switch? I'm adding the thumb warmer.

The kit OPT linked to has a thumb warmer and heated grips. It looks like one switch controls them both.

I've only had Polaris thumb warmers. They're easy to install and get really hot. Mine has a high/low switch and on high it gets so hot it will burn your bare skin. With gloves on it feels good but I use low more than high. A quick heat up on high then switching to low works for me.

Heat Demon makes a good one, you have 5 settings, from mild to blister.

Yes, the Heat Demon Dual Zone grips are very nice as those are now lock-on. I leave mine on year round as the grips are very solid grips even without the heat. But, experience a very cold day and/or add in rain, heated grips even in the summer in the CO high country are NICE!.

Heat Demon. Hate the name but they are good.

Now I'm thinking of a place they're hotter than but it never occurred to me before.