I have a WCB-24, 1988 vintage. I was heating my entire house (2400 square ft) with the unit and doing domestic hot water. I took the unit out of operation in 1990 and installed an oil-fired boiler, because I was travelling 2 1/2 hours round-trip to work and could not keep the fire going. However, since I'm now retired and the price of oil has gone ballistic, I've reinstalled the WCB-24. I've hooked it in parallel with the oil-fired boiler and have it connected to 2 zones (Each with its own circulator). One zone will circulate water between the 2 boilers and 2nd zone is hooked up to a 36 Gallon Indirect fired water heater. I've used wood and coal with this unit. Coal, of course, allows you to go longer between fill-ups. I've had some problems with the grates warping (probably because I was over firing the unit). I have replacement grates and firebrick. I want to rebuild the unit. However, I'm having problems with getting instructions on installation of the firebrick. I've called EFM to get some support on these instructions, they take my phone number and never call back. Any suggestions??