Can I drink warm/hot tap water?
This actually depends on how your tap water is warmed. 
If you have a personal water heater, which is connected to your tap with non-corrodable pipes, then there is essentially no difference. 

However, if the heating comes from a common source, then it would be very difficult to verify that the heater-tap connection does not contain any corrodable pipes. In this case, it might be better to not use the warm water for direct drinking, especially if the building is old.

A 7-year old house should not have lead pipes installed, since the Canadian Plumbing Code has banned lead pipes since 1975. As such, I believe that your warm water is safe to drink. 


  The National Plumbing Code allowed lead as an acceptable material for pipes until 1975 and in solder until 1986. All provinces and territories use the National Plumbing Code as a basis for their own regulations.