They also include a ceramic glass lining. TESY Bi-Light cylinders also include a built in thermal cut off switch. Electric Water Heaters. Electric Water. The Cylinders are required to be wired into fuse spur, they are NOT suitable to be plugged in via a socket (see installation manual for further details).
I purchased this as a replacement for an obsolete water heater in a caravan. It was very easy to fit, with good instructions and arrived next day delivery. I would recommend this product.
All good so far, quiet and quick heat up. Only problem I had was the mounting brackets are recessed at the back and tightening the bolts can draw out the wall plugs