Seconded. Lighting an open flame in an (partially) enclosed room without proper exhausting(a chimney and fire brick) is stupid and downright dangerous. Just dont. Sure it night be OK most of the time... Until the time it isn't and you burn (hopefully only your) place down (hopefully with you not in the flames). Also I guarantee you are poisoning yourself with carbon monoxide

In my experience the water valve will start leaking from the valve itself outside of the toilet . I've never had on of those valves close and not leak. I think my failure rate is 10 out of 11