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HVAC experts need help ?

hmardown

Member
Joined
Jan 13, 2018
Messages
8
trying to decide which horizontal hot water unit to go with. I'm coming off my oil boiler with one of these units. it's a straight shot from the boiler through the wall to my garage
(maybe10 to 12' away). unit is a modine either HC 47,000 btu or a HC 63,000 btu unit. I understand the btu #'s are going in & actually comes out to 21,100 or 37,900 coming out
(hope this makes sense & that's with 200* water). I live in NY area(hudson valley) so we do have some nasty winters. I've never seen the garage go below 34* & that was when it was
9* below(last week in fact). it's a two car garage. I have two insulated garage doors, one front wall insulated on the basement side, one wall half concrete & half insulated with a window and one wall all concrete with 75% of it back filled with dirt in front of house. ceiling is 9' high insulated & closed in with sheet-rock. the square footage is 720 sq.'. most the time with temps outside in 30- 35* range the garage is around 42 ish*. my goal is to be able to work in the garage with a shirt on. I'm not looking to maintain a steady 65* temp but want it to be 65* while I'm in the garage. I just want to turn the heat on wait till the garage heats up & go downstairs(maybe a 1/2 hr. warm up time). when I'm done I'll turn heat off. the boiler is plenty big enough so that's not an issue. I heat house with wood stove so boiler has light duty unless it's below 20*. the units I'm looking at are
Modine HC - 47,000 BTU - Hot Water/Steam Unit Heater or
Modine HC - 63,000 BTU - Hot Water/Steam Unit Heater.
my installer has some free time & I'm looking to pull the plug tomorrow. any help would be appreciated. I'm just concerned that the 63,000 unit is to much. causing it to fast cycle on & off.
thank you, Carlo

ps. have a neighbor with the 63,000 btu unit & a 4 car garage under house & it seems to be plenty big enough for His garage. but when I talk to the supply places they want me to go with the same unit 63,000.
 
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bobbyjean

Well-known member
Joined
Aug 25, 2017
Messages
319
Location
hudson valley n.y.
hmardown- it was around 0 and the garage was 34...your in good shape...you have a good portion of the garage "below" grade with good insulation.
think the smaller unit will be fine....being hydronic ....who cares if it runs longer...i like that route ...less thermal shock to your boiler,smaller footprint ,less money..just my 2 cents'
 
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hmardown

Member
Joined
Jan 13, 2018
Messages
8
Bobby
thanks for the come back. yeah, it was 18 * here this morning. so I went downstairs to read the where I'm going to install the unit & it was 44 *. like I've said I don't think the garage has ever been below 34*(with the doors closed of course). and I'll probably keep the thermostat at around 40* anyway. thanks. here's a link to what I'm getting.
hmardown

https://www.acwholesalers.com/Modin...Sa92tSAr2Utj2Fvd3hk3KghgPCcZnu8BoC76AQAvD_BwE
 
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