Pumps are TACO and can be purchased in a lot of different places that sell plumbing products. There are many variations, make sure you save the box flap or write down the entire part number. There are some very cheap prices around for pumps but they are plastic case/ plastic internals. The ones supplied by WM are brass/brass, big differance in price. The blower and draft solenoid are off the shelf items. On mine each mechanical item has a make and model tag, you can google the part numbers and many suppliers will come up. The only part that is a bit propitiatory os the ETC unit and even it could be purchased piece by piece I am sure, I have had no reason to tear into mine and look. I keep no spares but have searched some for prices and jobbers and you will shop hard to find prices much better than from Woodmaster's supply division, Outdoor Supply (I think) Since mine is going on its third year I am thinking about stocking the pump cartirdges for my pumps, a 011 and a 007 but that is it.