For example you might not be able to run more than one shower at a time without someone getting an arctic blast of cold water.
													
																	Tankless water heater closet size. 
									
	
		
	
																	Tankless water heaters are rated by the maximum temperature rise possible at a given flow rate. 
																	Therefore to size a demand water heater you need to determine the flow rate and the temperature rise you ll need for its application whole house or a remote application such as just a bathroom in your home. 
																	As an example i will show you what came out for me. 
																	Determine the mounting space tankless water heaters are much smaller than units with a storage tank allowing them to be wall mounted. 
															
													
									
	
		
	
																	Yes a gas water heater can be installed in a closet as long as the closet is not used for storage. 
																	I live in boston so my groundwater temperature is around 47 f. 
																	Having a water heater that is too small will result in it not being able to produce enough hot water for your household demand. 
																	Tankless water heaters are about the size of a carry on suitcase and can be installed on virtually any wall inside or outside of your home. 
															
													
									
	
		
	
																	Electric units have measurements in the 10 inch high to 7 inch. 
																	What size tankless water heater depends on your gpm at peak hot water demand. 
																	The international residential code irc specifically bans a storage closet as a location for a gas water heater. 
																	In fact it is the most important part of choosing a new unit for your home.