My hot water tank is less than two years old and worked fine until I replaced my furnace last year with a new high efficiency type furnace. Since then the pilot lite on my hot water tank keeps going out. They sit about a foot apart and the air intake from my furnace is facing the hot water tank, additionaly when they replaced the furnace the new code required that both units be vented through one pipe, ever since then I have had issues...any advice? Thanks