Use these if they will work with hot.They are amazing. Not had one drip or leak in nearly 2 years.http://www.gardinerpolesystems.co.uk/acatalog/QR-Metal-Hose-Couplings.html
Don't use this one on the hose reel because after a while the wear and the female connector gets jammed on http://www.gardinerpolesystems.co.uk/acatalog/Quick-Release-Metal-Hose-Plug-with----Female-Screw-Socket-QRM_PLUG_34_F_SCREW.html
You get what you need from wickes diy , £9 for a full set all in brass , you get one for the heater as in your pic , two of the females , take note though one of them is a waterstop type , this one is best used to join the reel , and you get a garden sprayer too !Rich
I will try , im a bit of a PC spoon !COMPUTER SAYS NO......Just go to the wickes diy site and put 209340 in the search bar.sorry im a pleb