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# How many feet of fin do I need?

#1
06-25-15, 05:15 AM
Member
Join Date: Jun 2015
Location: USA
Posts: 2
How many feet of fin do I need?

I live in northern NH and my living room does not heat up very well. The room is 15' x 13.5' with a 9.5' ceiling. It has 45 sq ft of windows and the insulation is R19 in two outside walls. Would someone please figure out how many feet of hot water baseboard fin I should have. As I cannot seem to be able to find a free calculator on the web. Thank you for all your time and trouble in this matter.

#2
06-25-15, 07:24 AM
Member
Join Date: Oct 2006
Location: USA
Posts: 23,539
How much is currently installed?

Is this a series loop?

Is the living room at the end of the loop? (if at the end of a long loop, the water will be cooler when it gets there)

How many feet of fintube are on the loop now (not connecting pipe, just the element itself)?

Are all of the other rooms OK?

How many zones do you have?

#3
06-25-15, 09:31 AM
Member
Join Date: Jun 2015
Location: USA
Posts: 2
There is currently two 6' sections, one on each of the outside walls.

Yes it is series loop.

The living room is not at the end of the loop.

I do not know what the total fintube is in the loop. Unfortunately I am not able to measure it at this time as I am not at that location.

All the other rooms are fine.

There is only one zone on this floor.

#4
06-25-15, 02:37 PM
Member
Join Date: Oct 2006
Location: USA
Posts: 23,539
Hi Brody,

There is a theoretical limit of about 65K BTUH on a fin-tube loop piped in 3/4" pipe. Going over by a few feet ain't the end of the world though.

All we can really do is offer an educated guesstimate how much more you might need.

Twelve feet of baseboard in that room should really be enough.

TYPICAL heat loss ballpark figure for most homes is say 25 - 35 BTUH per square foot. Not saying this is ALL homes, but just a general figure we can guess on.

That said, your 12' of BB should output enough heat at 550 BTUH per lineal foot of element.

Before cutting into the system, a few things to look at.

Does the room have wall to wall carpeting that is blocking the bottom air inlet of the BB in this room?

Have the covers been removed from the BB and the years of accumulated dust brushed and vacuumed out of the fins?

Is there anything else that may be blocking air flow, such as heavy furniture or drapery?

What is the condition of the windows? Single? Double pane? Storm windows?

#5
07-05-15, 06:42 PM
Member
Join Date: Jul 2007
Posts: 2,501
I just ran the load on your room. With the information supplied it is not completely accurate.
What direction are the two exposed walls facing?
Is there a heat room above this room?
Non-heated basement below?
Location of home to determine OD design temp.
The loss without this info is about 6k. 10 ft should work.