SWharton Posted October 19, 2017 Report Share Posted October 19, 2017 We have our Mr. Heater(Model MH18) connected in the MH directly from the MH tank, after the propane tank regulator. We have the special hose from Mr. Heater that they recommend to use with regulated MH pressure(we assume it is a passthru. We do not have a filter installed on the hose. It is a quick connect to the line from the propane tank. We are puzzled with what happened this morning. We were at 7000' for our second day with no problems. This morning(2nd day) Mr Heater worked fine. Out of the clear blue it turned off and would not relight. We assume Mr. Heater stopped working due to altitude but why did it work yesterday with no problems. We are now down to 6500' and Mr. Heater is working fine................ Thanks Link to comment Share on other sites More sharing options...
rockylarson Posted October 19, 2017 Report Share Posted October 19, 2017 Its listed max elevation is 7,000 ft. Changes in barometric pressure could vary your virtual altitude above that. Also it has an Automatic low oxygen shut-off system (ODS). Assume you keep a window cracked open while in use. Jan and Rocky Larson, Volunteers, USFWS , 9,300 hours each. 29 refuges since 2006. 2 new each year. 2004 Allegro 30DA, Workhorse 8.1, Banks, 2012 Jeep Liberty, Blue Ox Aladdin, 300 watts solar, 5 Optima group 31 AGM's, 2000w PSW inverter Philippians 4:11-13 KJV Link to comment Share on other sites More sharing options...
SWharton Posted October 20, 2017 Author Report Share Posted October 20, 2017 We have had catalytic heaters for 30 years and take all precautions. I know it is listed at 7000 ft but don't understand why it would work for a day and then decide there isn't enough oxygen. I guess pressure could be the cause but it worked for 2 hours this AM and then stopped. We are now down to 6500' so all is well and we will change our habits when around 7000' and above. Link to comment Share on other sites More sharing options...
Ed ke6bnl Posted October 20, 2017 Report Share Posted October 20, 2017 I purchased one at a swapmeet in Bishop California it is the single canister one with hi and low and it worked good just a small test time at 7165 feet of the Sierras. not a good test but am following the topic. 2000 National RV Sea Breeze 5th wheel 30ft. So.California 1950 F1 street rod 1949 F1 stock V8 flathead 1948 F6 350 chevy/rest stock, no dump bed shortened frame. 1953 chevy 3100 AD for 85 S10 frame 1968 Baha Bug with 2.2 ecotec motor 170 hp, king coil-overs,etc 1970 Baha Bug wihg 2332cc, King coil overs and everything else there is. 1998.5 Dodge 2500 4x4 Cummins, turbo, trans, injectors, lockers, bigger turbo,edge EZ upgrades for towing 35" BFG's, air dog lift pump etc. Link to comment Share on other sites More sharing options...
gjhunter01 Posted October 20, 2017 Report Share Posted October 20, 2017 Isn't the West coast expecting storms this weekend which would result in the barometric pressuring falling like rockylarson suggested. This could be enough of a pressure drop to shut Mr Heater down. Greg Link to comment Share on other sites More sharing options...
bigjim Posted October 20, 2017 Report Share Posted October 20, 2017 I have a different type of propane heater and occaisionally had the situation you describe at similar altitudes. Link to comment Share on other sites More sharing options...
SWharton Posted October 20, 2017 Author Report Share Posted October 20, 2017 We had an Olympian previously and never encountered this type of problem. Maybe it is unique to Mr Heater. guess I will go with the varying pressure answer................ thanks Link to comment Share on other sites More sharing options...
Bill Joyce Posted October 20, 2017 Report Share Posted October 20, 2017 Brick, blue flame and ceramic LP heaters do not like altitudes above 6000 feet. We had an Empire brick heater that behaved the same way at 7000 feet, due to the oxygen sensor. Catalytic heaters can run well up to 10000 to 12000 feet, since they do not have the oxygen sensor since there is no flame. 2004 40' Newmar Dutch Star DP towing an AWD 2020 Ford Escape Hybrid, Fulltimer July 2003 to October 2018, Parttimer now. Travels through much of 2013 - http://www.sacnoth.com - Bill, Diane and Evita (the cat) Link to comment Share on other sites More sharing options...
Ray,IN Posted October 25, 2017 Report Share Posted October 25, 2017 Looks like Enerco has improved the Mr. Heater lineup. A few years ago the little buddy model was the only model approved for use in an RV All models state 7,000' is maximum elevation. 2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country. John F. Kennedy 20 Jan 1961 Link to comment Share on other sites More sharing options...
SWharton Posted October 25, 2017 Author Report Share Posted October 25, 2017 After emailing back and forth with Mr. Heater the conclusion was we needed more air and open the window further. We are no longer at 7000' to try this but will keep it in mind. Never did explain why it worked for on day and not the next. Time to move on and live with the mystery. Link to comment Share on other sites More sharing options...
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