Mr Heater install question

[lightn95]

I just picked up the Mr Heater 50k BTU heater and I've got some questions regarding the exhaust ducting. I'm going to run my exhaust horizontal but I'm unsure of the pitch. The paper work says both ways, downward pitch and upward. To me downward makes sense for condensation. Which way did you guys pitch it?

Another question is where did you get the duct and is it stainless steel?

Thanks for the help

 

[lightn95]

Also can anyone post pictures of there heaters installed. I'm looking for location ideas.

 

[pbon]

You need a stainless cat 3 horizontal vent kit. Costs about $300. Must run 5’ and comes with a 45 degree angle so angle heater at 45 and you will have 90 degrees and come through the wall straight. Diagram and mark and measure. Basically put it near a corner of your garage so the heat blows diagonally across.

 

[LX-Markham]

As stated: CAT3 stainless for horizontal venting. Can be pricey.

I sloped mine inward and installed a condensation trap.

 

[lightn95]

Ok, so if I put it in the corner ( the only one that it can go in) and pull it out far enough for the 5ft min exhaust length. It will be over my head when in at my work bench or welders and tools.

The other location I can put it is in the middle of my back wall. It would be blowing across the garage, down the center.

Which location would you recommend?

 

[pbon]

Probably the middle of the back wall. You will just have to piece together your own cat 3 piping.

 

[lightn95]

Ok, id rather it went there anyway. The exhaust will ne alot easier and cleaner on the outside too.
How important is the 5' min exhaust length?

I can get the piping from a local HVAC co.

 

[cleanspg]

If I remember from my install, a 45 degree bend counts some amount of feet towards your minimum. 2.5' for each 45?

 

[lightn95]

What size gas line did you guys run?
The specs said 3/4, I bought all 3/4 line and fittings and the heater has 1/2 ! Can I reduce it at the heater or do I need all 1/2 fittings?

 

[pbon]

For 50k, 1/2 is plenty. If you run larger, buy a 1/2 to 3/4 adapter in whatever combination of fpt and mpt you need in 1/2 and 3/4 for the parts you have. No big deal.

 

[Cweeni00]

Hi guys,
I've been trying to vent my heater for a while too but I can't figure out what fitting I need first. Can anyone post a pic of the initial connection at the heater? I didn't buy the vent kit - just separate pieces and I'm not sure if I start with an adapter or can I start with straight pipe/45 deg. elbow. Any help would be appreciated. Also, sorry to hijack your thread

 

[pbon]

For my 50k, it was a 3 to 4 adapter since my pipe kit was 4. A bigger heater probably has 4.0 coming out the back. I think you can put a 4 inch elbow anywhere in the 4 inch piping. I put mine where it worked for the heater location and wall exit to work with the pipe lengths in my kit.

 

[Cweeni00]

My heater is 4" as it's an 80k btu unit. The problem I have is that the pipe wont fit inside the outlet of the unit. I picked up a 'universal adapter' at menards and it wont fit inside either. I spoke with Mr heater and they weren't much help - just wanted me to buy their full kit - which is twice as expensive of getting the parts separately. My last hope is a 'Rheem' adapter I just picked up and might try. Picture is of the new adapter with the outlet - looks like it'll work. Did your adapter fit inside or over your outlet

 

[D45]

You need a draft hood connect first, which gets attached to the first

The size of the gas line will depend on A LOT of variables, including the length of the run

I ran a 3/4" line for my 45K (which is now a 75K), but the run is probably 70 feet

 

[pbon]

It is supposed to go on the outside of the pipe coming from the heater, be sealed with high temp RTV, and have 3 sheet metal screws securing it. All connections must be caulked and screwed or have internal gaskets and retaining clamps.

 

[ogme042]

My heater is 4" as it's an 80k btu unit. The problem I have is that the pipe wont fit inside the outlet of the unit. I picked up a 'universal adapter' at menards and it wont fit inside either. I spoke with Mr heater and they weren't much help - just wanted me to buy their full kit - which is twice as expensive of getting the parts separately. My last hope is a 'Rheem' adapter I just picked up and might try. Picture is of the new adapter with the outlet - looks like it'll work. Did your adapter fit inside or over your outlet

Have the same question with mr heater 80kbtu. Picked up both the universal and Rheem. The universal does not fit outside or inside the vent coming out of the heater. The Rheem does fit on the outside, but as mentioned above, it probably needs to be sealed and secured with screws rather than the hose clamp.

 

[pbon]

Definitely if you want to follow instructions or code.

 

[kdt1970]

Mine is vertical, but maybe some of my pictures will help.

https://flic.kr/s/aHsmxuxHSv
https://www.garagejournal.com/forum/showthread.php?t=410096