Breaking down the cost of anything in life to a daily basis is one of the oldest salemans tricks in the book, everything sounds so much more affordable if broken down into small chunks, it's not a good way to make an assessment, if you apply it universally to several products you end up paying over the odds for everything. This isn't a judgement on hot water it's a general overview of value for money for everything we buy. Like I say, one of the oldest salemans trick there is,
Except when you aren't selling anything.
If it costs £2.50 a day and makes £12. 50 a day in extra work covered then go the other way... £10.00 a day (and less tired).
Doesn't sound much. Now let's times that by 100 days and hey presto - £1,000.00!
We can all play with numbers...
Exactly. ⬆️
Not sure what your point is NWH? 
Expenses for window cleaning have to be put into a daily basis surely. That’s the easiest to quantify.
X amount of turnover per day
X amount of running costs per day to earn that amount.
Firstly Johnny, I've been called a few things in my life but you've crossed a line calling me NWH, don't do it again...
Secondly, the point is its about mindset, if you reduce everything to its smallest value you can lose perspective very easily, marketing firms have been doing it for years. As an example, There's a ridiculously priced brush available out there (can't for the life of me remember it's name) but it's around the £300 mark compared to usual prices we're used to paying ie £40. At 300 v40 it's a no brainer for the vast majority of people, however. £300 over say 26 weeks(that's how long I tend to get from a brush) , based on working 6 days a week works out to £1.92 a day, ie you wouldn't blink an eye at that, suddenly it now looks quite reasonable, yet nothings actually changed, it's still a total rip off of a brush. As I said, it's a mind set thing, it's exactly the same price but you can talk yourself into thinking it's worth it. Much better to look at it as 300 v40 than 1.92 v 26p a day as the latter are trifling amounts and hide the real impact of wasting £260 on brush that doesn't live up to its billing (ask NWH, he bought one).
And your right Auravelling, you can do what you like with stats to suit only if you adopt the mindset that matketing people want you to it can be potentially damaging, much better to see the whole picture and make a judgement.
None of which is a swipe at people using imersion heaters, I personally use an aquarium heater when frost is forecast, I see imersions as a fairly cheap upgrade if only used in wintery conditions, using them constantly though,..... Nah, not for a sole trader with a full round doing maintenance cleans, I like to keep an open mind but far from being convinced on this.
