RV News RVBusiness 2021 Top 10 RVs of the Year, plus 56 additional debuts and must-see units → ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 01-06-2017, 11:03 AM   #29
Senior Member
 
tderonne's Avatar
 
Join Date: Dec 2003
Location: Motor City, Mich
Posts: 2,997
Folks have mentioned square feet, and cubic feet to determine what heat is needed. What really needs to be done is a heat loss calculation. Home HVAC professionals would have you believe that it's as complicated as say, putting a man on the moon.

In reality, it's easy. The BTU/hr required to heat a room is the square feet of surface area divided by the R value times the delta temperature. That is typically multiplied by an air exchange factor. That's it.

So, my motorhome (31') has about 1100 square feet of floor, ceiling and walls (with the slides out). I approximate the R-value as an average of 4 (say 5 in walls, and 1 in windows). On a 30 day I need 1100*40/4 = 11,00 BTU/hr to overcome that heat loss to reach 70 (40 delta), simple.

I could break it down by separate areas, like for the windows by measuring them, but 11,000 is a good ballpark number. Suggests two 5000 BTU/hr electric heaters won't quite cut it. Especially if you account for some air infiltration. That agrees nicely with what most folks are reporting.
__________________
Tim.

tderonne is online now   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 01-06-2017, 07:42 PM   #30
Junior Member
 
Join Date: Nov 2016
Posts: 10
I was hoping that my problem had some solutions and you guys came through again! Thanks alot for your responses. I am going to look into some of the recommended Reflectix for the windows, closing off the front with some sort of insulating blanket and I am especially interested in the catalytic heater. Not so hot on the snow suit, although I appreciate your response. Again, thanks all, now I have some work to do...
classAguy is offline   Reply With Quote
Old 01-06-2017, 08:44 PM   #31
Senior Member
 
FatChance's Avatar
 
Join Date: Mar 2015
Posts: 2,950
Do some research on how much water vapor a catalytic heater puts out because humidity control is as important as heat production.
__________________
'04 Newmar Mountain Aire 4016
400ISL/Freightliner
FatChance is offline   Reply With Quote
Old 01-07-2017, 07:57 AM   #32
Senior Member
 
Murf2u's Avatar
 
Join Date: Aug 2011
Location: Near Toronto, Canada
Posts: 1,842
Quote:
Originally Posted by classAguy View Post
I have a 36' Bounder (2009) and have been attempting to keep it warm by plugging in a space heater. I have tried 3 space heaters, the last one from Camping World that says it heats up to a 600 sq ft space. The outside temp here is now 21 degrees, the coach got up to 37 degrees with the heater on full blast.

Any thoughts would be helpful. thanks...


Keeping the coach warm is one thing, GETTING it warm is a completely different thing.
__________________
Ted 'n' Laurie, plus Jackson (aka Deputy Dog, the Parson Russell Terrier 'fur kid') and, Rylie (who crossed the Rainbow Bridge June 14, 2012).
Murf2u is offline   Reply With Quote
Old 01-07-2017, 01:32 PM   #33
Senior Member
 
rapid rick's Avatar
 
Fleetwood Owners Club
Join Date: May 2013
Location: CT
Posts: 658
tderonne,
You are absolutely correct in regards to the heat output of my heater @ 5100 btu . Got me thinking this morning, why does it SEEM to put out more heat and keep temp in my coach warmer than it theoretically should? What could possibly be different with my coach from others? Came to me after reading your last post in regards to heat loss, and it clicked...in my terra the basement is open side to side, from front to back,wet bay is directly behind rear wheels on drivers side and vacuflush on pass side with grey and black tanks mounted in between,fresh tanks in between rear wheels. 2 years ago in anticipation of cold weather travel, I insulated the entire basement floor, including all rotocast cargo holds and under side of floor(ceiling of cargo holds) with 1/2" eco-fiber padding,Same stuff that is used under all auto carpets. After this was done I had to reduce the heat going into the basement as it was getting too hot,and staying hot.I have since eliminated the heat duct going to the basement,using only a small electric heater in the vacuum generator bay, which does not have eco-fiber in it,but a armoflex type insulation,glued to inside of bay, with removable bottom for washing. I replaced The cab carpet, added eco-fiber padding and dyno-mat under it. Now, getting back to your heat loss comment, could all this insulation under the floor make that much difference? Like I stated earlier,After running the propane furnace to heat the coach and it's contents, this heater does a very good job.Yea, doing the whole basement was a lot of work,not to mention $150.00 for the pad,done originally just to keep tanks warm, and to retain heat, but looks like this has also helped keep the inside of coach warmer also. On a side note,all mcd shades are down,slides out, outside temp approx 32 degrees. Floor of coach which is vinyl is noticeably warmer than it was before the basement was insulated.
__________________

Rapid Rick
2013 Fleetwood Terra 35K
rapid rick is offline   Reply With Quote
Old 01-07-2017, 06:20 PM   #34
Senior Member
 
Join Date: Sep 2015
Location: Houston, TX
Posts: 272
Of all the post I've read about rv heating, I have not run accross people talking about heat strips in the rooftop ac's. Both ac's in our '94 Allegro Bus have electric heat strips. I don't know how many watts they are but they kept us plenty warm at the Albuquerque balloon fiesta where the overnight temps were around the freezing mark. I'm not sure if they would cut it in 21 degree temps. Are heating elements in rooftop ac's not common on later models, and if not, why?
Fugitive861 is offline   Reply With Quote
Reply

Tags
ace, heat, heater



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Atwood 8525II furnace blower not cutting on Zoom45 Vintage RV's 3 10-17-2015 10:07 AM
Atwood water heater cutting out davc2000 RV Systems & Appliances 1 10-26-2012 03:47 AM
front leverlers not descending & generator cutting off plpwv Class A Motorhome Discussions 1 07-07-2012 04:25 PM
Maximize living space/minimize sleeping space? Wander Travel Trailer Discussion 1 08-23-2011 12:13 PM
Power Gear slide not cutting off and shearing bolt baustin MH-General Discussions & Problems 5 07-07-2010 08:19 PM


All times are GMT -6. The time now is 09:25 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.