On Sun, 11 Nov 2012 12:32:44 +0000, Tim Lamb
wrote:

In message ,
writes

I still cannot figure why a sophisticated bit of kit like a modern gas
boiler, which is fueled by a gas that is readily combustible, has a
fan, yet a wood fire which has a low cv fuel which is difficult to
cleanly burn and would benefit from the turbulence and air control is
resisted.

Maybe because the gas can be shut off whereas a charged log grate can't?

There can be ways around that, generally natural draught can provide
for a safe burn out as long as primary air is limited in case of fan
failure. With a single id fan , as on many pellet stoves, this becomes
self limiting.

AJH