Hi Daz, the red gardiners sill brush for heat is a great brush if you're running it really hot, otherwise the medium ones are ok for warm but you do have to remember to let the brush do the work as they flatten out with the heat if you push to hard on the glass, the heaters are easy to fit, if you're not going to flue it then obviously stick it near the back door, once you've hung the heater you will be able to use a hoselock from your pumpbox to the feed in on the heater, the problem then is the hot out to your reel, hoselocks will warp and blow off with the heat and added pressure caused by the heat, we use a red washing machine hose from heater to the reel-it should screw straight onto the heater, we then cut the connector off at the hose end and jubileed this to a spinning hose fitting that we bought from a pressure washing outlet near us, once your used to it there will be many advantages over cold but do remember the heat will show up any flaws in your system from the heater to the end of your brush, hope this helps you can ring if u get stuck, the numbers on the website.
Graham