Been using a Coleman extreme fora few seasons now and wouldnt use anything else now. Couple of years ago when we did have a summer was still having ice in drinks on the monday after a long weekend.
I use a Colemans blackcat propane heater Again used it for years now and soon takes the chill out of a tent Even a big one
Having used both posh bucket and chemical loo I would go for the chemical loo cleaner no smells easy to empty. Chemicals are cheap and if only away for a weekend can be add before you leave home to save carrying them