Get a free quote from Pete the Plumber. I just had them in to install a new hot water tank at my place and was happy with their services. They are the biggest buyer of Rheem products in Calgary so they actually have really good pricing for the units themselves (def hot water tanks - i assume tankless Rheems they get good deals too). they may be a bit more expensive on labour than other companies but i figure the savings on the unit itself balances out against the labour. Not to mention the fact you get a professional reputable company and a solid warranty to boot.