Larry McGaugh from RV Comfort Systems sent me an email the following is that email.
I have tried to log on to the Jayco Owners forums but for some reason it won't recognize my user name. The Stand-A-Lone system provides the same amount of heat as the Add-on System.
CH50-DH50 comparable to a 40,000 btu Gas furnace
CH50-DH37 Comparable to a 30,000 btu Gas furnace
CH50-DH18 Comparable to a 20,000 btu Gas furnace
The DH37 and DH50 require a 50 amp service.
When talking about heat output, remember that a gas furnace is only 60% efficient, 40% of the heat goes out the flue. But an Electric heater has no flue so its 100% efficient. So means a 40,000 btu furnace in is only 24,000 btu output. Additionally a gas furnace has a 60 sec pre-purge cycle and a 90 sec post-purge cycle. Which means that for every heating cycle there is 2 1/2 minutes of run time with no flame (heat). After taking the 2 1/2 minutes of no fire each heat cycle your true output into the coach is about 18,000 btu measured at the register.
Our DH50 has a true 17,500 btu output to the register (add-on or Stand-A-Lone). The best way to explain it is if you measure the temp at the floor register the electric is with in 5 degrees + or - depending on the length of the ducting. The DH50 draws 21 amps (about the same as 2 roof AC) per leg on a 50-amp service leaving 29 amps per leg to run the coach (58 amps at 120 VAC to run the coach).
RV Comfort Systems
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