Sorry I haven't gotten pics yet, spent the night trying to figure out how to save a sick RBTA but it didn't make it.
To answer your questions:
1) So far it hasn't effected the temp of the tank too much. However, I am only running about a 6hr photoperiod right now. My tank fluctuates between 80 during the night to almost 81-82 during the day. As long as it stays that low I am not too concerned.
2) The unit is about 4-5" above the tank. No, I do not have glass on the tank. This will cause a little more evaporation, but it allows for a lot more gas exchange and the MH
bulbs are high enough that there is almost no chance of any water hitting them and causing problems.