hi Donna,
whether or not it will deter future tenants depends on other factors.
The big one being rent, if the rent is discounted to reflect the difference then it should be okay.
if you can show electric bills from previous tenants and show that your rents are lower than market for the area to make up for the difference in cost to them, then you should be okay. That being said, paying for electric heat can still be a deterrant to many people because of the unknown of changes to hydro costs. Rent increases are capped, but utilites are not, so the apts need to be a little extra appealing to make it worth their while to take the risk, that can be either in actual rent price, nicer apt, or location.
Location is just as important in renting as it is in buying. If the property is in a high demand location tenants will overlook a lot of other things.
The other thing you can explain to them to promote the electric baseboards is the fact that they can control the heat. Forced air can sometimes be a real problem in houses that have been converted into apts. One apt is too hot, the other too cold.
When I advertise apts for rent that aren`t all inclusive, I usually advertise it at the total cost they would pay including utilities(approximating of course). I know this sounds crazy, most people would want to advertise it at the lowest possible price and then in small print "plus utilites". I think that just attracts people that are looking for cheap rent. I advertise at the total cost, and when they come to see the place, I explain the breakdown in costs, that way the only people that show up are the ones that can afford it.
Hope that helps,
Terri