not hot enough

shawn_3

I had went to a service call this week start of heating season the people just bought the house the thermostat will only get about to 70 degrees and it takes basically almost all day to get to that temp they used wirsbo hepex 5/8 tubing it is about 280 ft run everything seems fine on the boiler basically this happens on the first floor and in the basement they rooms with heat in it mostly they require lets say 10 ft but there is only 7ft of baseboard in the room also water temp runs out 180 and comes back about 140 is that because of the tubing. the first floor has a total of about50ft of baseboard run on first floor
any thing would help me so i can stop ripping my hair out.

Mad Dog

Do anybody do a heatloss?

Do one - but get paid for it. They may not have enough heat to heat the house..seen quite a few over the years. Could have no or poor insulation. Several years ago, before I learned my lesson, I repiped an old house with slant fin 30 baseboard. Thought i put in plenty. Would have been plenty if house had ANY insulation. It did not!!!! House would not go above 70, on coldest days even if you ran it non stop. Tried to turn up boiler temp.....NOT! Finally had to replace all baseboard with Slant Fin 80 High output. Expensive lesson. After that I ALWAYS DID MY heatloss - even the old long hand way. Now Slant Fin gives you the softwa...gotta get it pal. Mad Dog

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paul lessard_2

try to split the loop

Hey chuck. where are ya bud?

kf_2

Not hot enough

My guess is pressure drop is to high through the PEX. 50' of baseboard is approximately 25,000 - 30,000 BTU/hr at 180 degrees. That would require about a 2.5 or 3 GPM flow rate.

At only 2.5 GPM's 5/8 PEX has a pressure drop of about .08 feet of head per foot of PEX. Multiply that by 280' gives you a pressure drop of about 22 feet of head.

If this zone only has a little old Taco 007 pump that at 2.5 GPM's only gives you about 10' of head you don't have enough.

Here is the bad news, if you put a pump on to meet these requirements (such as a Taco 009) you may have velocity noises.

Best thing to do if possible is use larger PEX or split the loop.


kf