Today's letters: Turning up the heat

Asking too much of water heaters
Re: Gas water heaters an ideal solution for Canadian space heating, March 6.
The Canadian Institute of Plumbing and Heating takes issue with this article. CIPH is a not-for-profit trade association representing more than 283 companies that manufacture and distribute plumbing, heating, hydronic, industrial PVF, and waterworks, and other mechanical products. 
The article is promoting the use of water heaters for combined space and water heating applicatio