For a 375 watt hose mounted heater (the one I have), look no further than the awesome kit from www.**************.com

Search for "block heater" and it will bring up the kit. I'd never attempt the block mounted heater, the risk of cracking the block/having lots of problems etc made it seem just not worth it to me.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
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'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)