I have been WFP since 2005 and only use cold water. I have always said it makes no difference if cold or hot.
during this cold spell I needed to think of a way to keep warm. I have been reading on here that if you drop a fish heater in the tank it will at least keep you a little warm , also with better and supple pipes and hose.
Last week I put two fish heaters in the tank 300w each max 34c lagged the tank and wow! what a difference, the tank stayed warm all day and when home was still 26c. Two days ago I bypassed the thermostat so they did not turn off at 34c. In the morning had a reading of 46c made my day so much better.
Now to the fun part, in my opinion and from cleaning windows for a few years the little heat i did have from the water made such a difference to better cleaning including bird poo and the water behaved in a better way while running down the glass and the brush was much smoother over the surface. I will be investigating In getting hotter but not gas as just enjoying having a little heat though out the day.
Gazza