"Although this is slightly more expensive than the flat ring spanner I would thoroughly recommend this. It feels like it will last a few generations. It undid my old immersion heater with ease. I managed to thread the mains lead through the socket and still undo it so no need to remove the cabling first - once unplugged! This is twice the price for 10 times the quality."
"removed my heater in no time. fitted the new one. In all it took me about five minutes excluding draining tank. you always get someone who expect something for nothing and then moan about it !!!!!!!!!!!!!!"
"Spanner fitted perfectly after a few burrs were lightly filed off. Much stronger than a pressed steel cranked spanner, it removed the old heater and replaced the new one on a foam insulated cylinder with no trouble at all.
"Very good bit of kit, bought this to try & remove my old immersion heater, unfortunately the heater was well & truly stuck to the point on bending the “tommy bar”. However this is a great tool at a reasonable price and will not damage the cylinder lagging, unlike the spanner type."
"I try this box spanner after buying Ring spanner to remove Heater. Has they was no room to turn Ring spanner and was bend the top of tank the box spanner was larger than the ring spanner by 1mm and slip round heater nut till filling gap with 2p coin one of the flats work great after that"
"I would just like to add the other comment here. The spanner fit my old immersion element and the new one (from Screwfix) just fine. The old one was hard to get out, but the spanner did it without chewing the nut up or slipping. It it slips when putting in the new element, you're doing up too tight!"
"I found this spanner slightly too big for the immersion heater nut and unless you're very careful it will drop completely over the nut and dig into the copper cylinder while turning it. Had to go back to my flat immersion spanner which easily undone the immersion and was far more controllable."