Water kettle recommendations

Staub cast iron is nicely made.. not really all that cheap though. Made in France (I think)
http://www.amazon.com/Staub-Enamel-Teapot-Kettle-Quart/dp/B005EH0V4Y

Personally? I'd get a cheapo non-enameled cast iron humidifier for the top of the stove, and just heat my tea separate... if you run the pot dry often, you'll build up some funky deposits that I wouldn't really want to drink out of.

I use this for coffee and tea water on the kitchen stove and the wood stove and it works great. Not cast iron, but it's what works best for me.
Made in China, but good luck finding one that's not for a decent price.
http://www.amazon.com/Chinook-Timberline-Stainless-Coffee-Percolator/dp/B001J2HFX8/ref=sr_1_17?ie=UTF8&qid=1410874706&sr=8-17&keywords=8 cup stainless percolator
Can't beat a hot cup of pressed french roast in front of the stove on a cold Sunday morning.
I never use it for a steamer pot though, those things get yucky inside.
We did a steamer pot last year and while it helped, it was a chore to keep it filled and not at all convenient.

cast iron will rust, even painted, and the water will get very nasty. I would not drink water out of any made in china painted cast iron kettles, who knows what kind of paint (lead) they may have used.

IMHO if you like your stove, the kettles will NOT add significant humidity and will potentially scratch and be a source for rust on your stove from the splatters from the kettle.

I have a cheapo TSC cast teapot on top of my BK. I agree I would NOT drink from it but, our home is well sealed. My wife notices the humidity difference and sincerely appreciates it! So do my hardwood floors The difference to me is subtle; not to her tho. As far as nicks or scratches, high temp touch up matt finish bbq paint takes care of that for us. To us, it's a utility item. Yeah, I care for how it looks but, function takes precedence. The co$t savings is unbelievable versus the prior decade of propane. Before that we were strictly wood and humidity; wherever, however, makes a huge comfort adjustment for "us"... to each our own

I'd heat my water elsewhere, and if I needed humidity, I'd use a humidifier. If I wanted some nice scent in the air, I might put a little pot of water and potpourri or oil on the stove top on a trivet, but I wouldn't let it run dry. Rick

Rick; great idea on the scent we loose commercial power so often a standalone humidifier doesn't fair well for us. The teapot on top of the convection deck lasts all day for us. Thanks for the scent tip never thought of that and, I've been burning wood most of my life (*ha)

Try Lodge they make good cast products

We have the Chinee cast kettle from TSC. It does a good job adding some moisture to the air but it's not for making beverages.

Whatever you decide, be sure to get a trivet for it. The trivet will reduce the chance of stovetop scratching.

I have used a 3 gal stainless stock pot for about 15 yrs. It will boil off 2 + gal everytime the stove gets re-loaded, sometimes getting refilled 2-4 times per day. If I had to do over I would use a turkey cooker pot. I don't run that stove anymore, used an Englander 28-3500 furnace the last 1.5 winters.