wow that took some reading .......14 pages of willy waving 4 pages of spruce and his big brain lol 
can i ask a few questions what really matters ..... you invest xyz in hot water in cash terms per day / week / month are you better off with buying it ? in turn how long before you get you money back ? and start to see real profit on xyz
how long does the warranty last on these is it three years ? parts and labor ?? again more cost if its only a year
surely if you spending 25k of a full new system and van you must have these numbers to hand compared to ruining the old unit you got rid of ?
Warranty is a year parts and labour depending who you buy stuff off
How much time does it save , that depends on the type of work you are doing on salty costal work and one off cleans and first cleans I find it halves the time taken
Is it worth the money in my book yes I would never go back to cold I was cold wfp for 10 years and hot for the last 4 , with hind sight I would have gone hot long before
To work out how much more you can earn using hot is impossible say again depends what work you are doing if you are doing first cleans evey day a huge time saving is made if doing 4 weekly maintenance cleans then less time saved but removing seagull poo , salt , fly dirts, bee pollen etc on maintenance cleans does make it quicker it’s also quicker during the winter months as the hoses are far more manageable
We do a lot of large commercial work on hotels : nursing homes : industrial building cleaning , plastic cleans especially on plastic cleans we are regularly 30-40% quicker , I know this as we do dozens of identical properties with hot that took 30-40 % longer to do with cold also using hot you don’t have to use chemicals so the cost of hot saves that cost . There will always be those that are sceptical and say hot isn’t needed , I was one of those people for years now having used it for 4 years I can see how much quicker and better it is , some of my staff before working for me worked for other cleaners using cold and every one of them sais that hot is far better and quicker .
Running costs are high I reckon it burns 1:5 ltr per hour x that by 40 hours a week it’s not cheap but again as far as Ime conserved it’s a cheap price to pay for the extra work we do in a week , if you are a sole trader earning £100 a day you arnt going to make it pay , but if you are an established sole trader or bigger company earning £250 per day upwards it’s a no brainier
As for maintenance costs mine is now 4 years old it runs a minimum of 8 hours a day 5 days a week and I haven’t spent a penny on it so far , Ime no mathematician but think that’s around 8,000 running hours working on a 48 week year ?.. if it goes bang tomorrow I don’t think that’s expensive considering what I have arnt over that time
