need info on heating/hot water system please

Hello eveyone, I havent posted in a while, some of you may remember me from previous posts. Well, we made it to Maine! Moved from Florida and BAM! got hit with snow the first week we were here! So much for the mild maine winters last few years! LOL!! I love it!
Can someone help me understand how my heating system works? I have a forced hot water oil burning heating system. It also heats the hot water for the faucets. It uses a normal thermostat on the wall to control the home heating, but i dont understand how it keeps the water hot for the faucets when the heat is not on. We are running out of hot water pretty fast, so I have to turn the thermostat up so that the furnace kicks on, then along with the house geting warmer, I get some more hot water. It does have a hot water storage tank, not very large, but I dont see any sensors or switches that control the furnace for just the hot water. How will we get hot water in the summer months? I must be missing something.... any help would be appreciated!
-- donald carter

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