I have some questions about installing a MB40. I have a oil boiler now and I know I need a dump zone for the wood(actually it will be coal)boiler. So why cant I use a swing check valve instead of a normal open zone valve. That is my first question. I will start with that.
	
		
			
		
		
	
				
			 
	 
	 
 
		 
 
		 
 
		 
 
		