We had a fireplace in our last motorhome. Of all the appliances in the motorhome, the fireplace got the most use. We used it almost every night to keep the chill off, Really miss it now but not willing to give up the storage cabinet. If you can find one with HI/LOW (800 watts/1500 watts) heat, you'll have no problem running on 30 amps. In reality, you can only draw about 25 amps without heating up the circuit breaker and causing it to trip. We always opt for a 30 amp site because of the cost difference and have no problem. We'll run on electric water heater and one space heater on low with no problem. It was hard to train the wife to turn off the water heater if she wanted to used the microwave or her hair dryer but (most of the time now) she remembers and we're okay. If it's a colder night, we'll turn off the water heater and turn on two space heaters with one on low and the other on high and we still have enough power to run the refrigerator on electric and keep snug using our electric blanket. We've got an inverter/charger I set as if we only have 5 amp service. It takes longer to top of the batteries that way but that's never been a problem and the battery LED charge indicator always turns green.