I use hot summer and winter so I'm biased plumed into fuel tank so don't really notice cost even though I know ther is one
I mainly use hot as I personally find it easier to work with less scrubbing, and quicker overall with less strain on my body, which is of concern to me as few years ago was told I should not carry on working by hospital, but good acupuncture and Chriopacter I'm back full time
When you've been poleling as long as me, you do take that into account
Heating has downsides, more flexable hose can be an annoying I go through brushes quicker yet still I feal benefits outweighs cons
Ironically though I wouldn't pay for cleaner planner purely as george is sufficient for needs as sole trader I don't print work schedules, majority invoices emailed, don't use the accounts side of things just monthly financial reports
But if you're younger and given lack of heavy winters with hard frost even given week or so when could be so bad you couldn't work, so very rare these days
cold water is absolutely fine used it for over 16 years been on hot over 5 now maybe 6