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# How much baseboard per room.

Member Posts: 14
I am renovating all three bedrooms. I want to know the formula to calculate how many BTU's are required to heat each room. How many liner ft of baseboard per room. Each room is getting new insulation, new windows (they will be bigger due to egress regulations, and new exterior, foam backed vinyl siding.

## Comments

• Member Posts: 3,085
edited August 2013
That Would Require

You to do a heat loss..

http://www.slantfin.com/index.php/professionals/heatloss

Once you get that you need to pull the technical literature for the brand of baseboard you plan on installing and divide the heat loss of the room by the btu/hr per ft output of the board at the water temperature and flow rate you need to get your needed lengths. To calculate flow rate the formula is:

gpm = btu/hr / (Delta-t x 500)

Delta-t is the difference between the zones supply and return water temperatures. Example, a typical baseboard system uses a 20 degree delta-t, 180 supply, 160 return.
"The bitter taste of a poor installation remains much longer than the sweet taste of the lowest price."
• Member Posts: 7,107
edited August 2013
Heat loss

Step one- Do a heat loss calc. There are good free calculators on line.

Step two- Determine your boiler design temp. Conventional boilers will usually be around 170. With condensing boilers, the lower the better (max. 140).

Step 3-Look at the output chart from the heater manufacture and pick the size that matches your design temp and heat loss calc.

Carl

Chris beat me to it, Oh well
"If you can't explain it simply, you don't understand it well enough"
Albert Einstein
• Member Posts: 2,662
Good advice

What Chris & Carl said . Do the heat loss . Nothing to add .
You didn't get what you didn't pay for and it will never be what you thought it would .
Langans Plumbing & Heating LLC
732-751-1560
Serving most of New Jersey, Eastern Pa .
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Rich McGrath 732-581-3833
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