We're putting a dishwasher in our office, and the only way to get hot water to it is straight from the hot water heater. I've done my fair share of home plumbing, but I don't want to take a chance on messing something up in the office. Here is a picture of the water heater setup --

https://drive.Google.com/file/d/0B5rKcbh2oXjUYXJ2UUo3cXVHUzg/edit?usp=sharing

Can just put in a T, or is this more complicated?

No sink nearby? If there is a sink it will be faster/easier to just cut a tee and a new shutoff in for the DW.

If there is no sink nearby then yes, just cut a tee AND a shutoff into the hot water pipe at the water heater... just be sure to connect into the hot water pipe AFTER the mixing valve... ;)

Mark

Mark asked important question. Usually, dishwasher drain is hooked up to a sink drain ( point of connection is under the sink ).

If you have sink close by than just install double angle stop to feed both the sink and DW.

Back to you. Milo