These tanks are NOT for water fed pole window cleaning.....................You STILL need to heat the water before it goes in and here lies the problem..................i fill with my hot water at home...WRONG..unless you have a big enough tank in your loft which none of us do,i drill a hole in the bottom and fit a element......WRONG........these tanks are even THICKER than the normal tanks and you can only just about attach an element to them!!!................solution............try fitting an element in your original tank,this CAN be done but must be done with great care see past threads for info......or SAVE up which is what i am personnally doing and have a ionics/pure freedom hotbox etc etc ....PROFESSIONALLY fitted and if you work an extra 2/3 weeks at winter time from what you have in the past it will have paid for itself in the first winter..........