No worries.
I am amazed at the benefit hot provides, I was a huge doubter but glad we took the plunge. We find the benefits numerous, such as, a simple frost stat solution, no more covers, plug in heaters etc etc, ability to work unhindered in all weathers, flexible hoses all year round, increased productivity, snail trails, bee pollen, spider poo, algae etc simply wipes away. Surprised to say I use it all year round. It definitely uses more deisel but no idea how much, haven't bothered calculating costs as I'm confident that they'd be blown away by the efficiency gain. Not the most precise response but hope it helps.
John