This may not be what you were hoping to hear but the setup you have now for the stove is insanely unsafe. Every time you connect/disconnect a propane appliance you should be having a pro pressure test the system. Safe to assume this is not being done? Propane tanks have a safety release valve that will exhaust gas into the air if the pressure becomes too high. This isn't great outside but it's not an automatic explosion either. Inside however there is a much much greater risk of an ignition source lighting the vented gas. Such as your space heaters. Turning off the main valve does not override the safety valve. It can still vent even with that shut off. Being in another room is unlikely to help you much. Pressurized gas makes for one hell of a fire. Without doing the pressure tests you have no idea what you are working with! Please, I handle gas and hazmat products everyday for work, this is nothing to play with, please if you don't do anything else just unhook those tanks and set them outside. See if you can find a cheap/free barbeque for cooking outside until you can figure something out. Are there any government programs available to you that can help you get a tank outside and hooked up properly? I know almost nothing about Canada but we have many programs for low income people in the US so there must be something for you? I'm sorry the house isn't working out like you'd hoped Please be safe and hopefully you can get this straightened out.