If you try it lads/lasses i hope it works like it has for me seriously i know its a pain not earning.....also if it costs a few pounds on the elec to get you through this winter youll still be earning to pay it off good luck
ive just asked plumber mate he said as long as at least 60 - 70 % is covered it should be ok
Aye plumbers and elecy like window cleaners one says this one says that lol .......... i filled my tank yesterday with about 1/3 empty heated this morn for 3 hours ish it was perfect .. ive just gone to look and its heating back up again when switched on.....
so i suppose at £13.oo its a gamble if it blows when partly covered a few pound to put another in and completely cover it i suppose trial and error