Ben & Darren,
I will as always give you my honest opinion, which I am sure others will totally disagree with me.
Firstly Ben, yes they are still in business and if you decide to get one from them let me know, and I will tell you who to deal with as like some on here will say all they want is your money then cannot be bothered with after sales if things go wrong, let me know and I will help you.
I looked in to buying one years ago, and I think I bought my first one from Brodex about 3 years ago, and have had no problems with it at all.
When it is turned on full it is seriously boiling which is superb on certain types of work, and then you can lower it for others, and when the weather is cold.
I think it was £3k, but to be honest it is a brilliant piece of kit that we use on a regular basis.
I started with no money at all when I set up my business over 20 years ago, and I am the old fashioned type of window cleaner, but have moved with the times so to speak.
Depending on what you actually want from a hot water system, I cannot speak highly enough of the ones we have, and I welcome you to come and see how it works and our set ups if either of you require.
I am not much good over a computer but am willing to speak on phone or meet in person to help either of you move forward with any advice or help I can.