I have water temp of 170-180 with 11 radiators and only lose 2-3 degrees from start to finish. The house is cold and not sure why, I just reinsulated the crawspace, any help would be great. These are 3/4 copper radiatos with fins, about two years old now. Thanks

What is the size of each unit

First what is the squar footage that each radiator is having to warm,

What is the heat loss at doors, windows

what is the size of each unit

first what is the squar footage that each radiator is having to warm,

What is the heat loss at doors, windows

each room has different sizes from six to eight an two tweleve footers biggest room maybe 12x12 if that I have new window installed and cold air entering is not a factor pretty sealed up, my neighbor also has radiant heat and his water temp is 150-170 and has less radiotor per room and the house is a lot older but is warmer than mine, I have a water to air exchanger ordered to add to the line so hoping it will make a big difference exchanger will be a 12x18

lose 2-3 degrees from start to finish

Something is wrong with this picture since that is a very low. Take a reading at the boiler at the discharge and the a temp reading at the return with all radiation in operation and post the numbers. I need to see the total split.

lose 2-3 degrees from start to finish

Something is wrong with this picture since that is a very low. Take a reading at the boiler at the discharge and the a temp reading at the return with all radiation in operation and post the numbers. I need to see the total split.

Thanks for question, I have an outdoor furnace the temp is 165-180, I can put a thermometer at the first radiator and it is same at furnace and the last radiator is only 2-3 loss just not sure why I am not getting much heat off, there is now air in line.? Just a big mystery? We used to heat with indoor wood stove and was great but only in that room.

there is now air in line

This could be your problem

Bleed line

Make sure you have 12 psi on the water pressure gauge when operating.

Is there an expansion tank on the system for outside?

there is now air in line

This could be your problem

Bleed line

Make sure you have 12 psi on the water pressure guage when operating.

Is there an expansion tank on the system for outside?

I spelled no wrong there is NO air in line, so what next I have a taco 1/8th hp circulator and model number 009-bf5-j 1.40amp, don't think this is the prob as water temp is about the same at both ends of loop

What is the system water pressure?? Second time waiting for answer.

Unless you are pumping water upstairs the 1/8 hp pump should be OK if it is in good operating condition UNLESS the outdoor unit is 50 feet away. The correct pressure is more important.

What is the system water pressure??? Second time waiting for answer.

Unless you are pumping water upstairs the 1/8 hp pump should be OK if it is in good operating condition UNLESS the outdoor unit is 50 feet away. The correct pressure is more important.

Non pressure system and the furnace is above the circulator and not heating upstairs just first floor,

First system I ever heard of with no pressure. What does the pump pump up against? If you have no pressure at all then I cannot see how the system would work unless it is a gravity system. At this point I have nothing more to add since I am sure you have much more knowledge than me since you know about non pressure systems and I do not. Good luck with your project.

First system I ever heard of with no pressure. What does the pump pump up against? If you have no pressure at all then I cannot see how the system would work unless it is a gravity system. At this point I have nothing more to add since I am sure you have much more knowledge than me since you know about non pressure systems and I do not. Good luck with your project.


The funace heats up 180 gallons and is gravity pressure to the circulator so yes gravity puts pressure to the circulator which then when on circulates. I believe it is called and open not closed pressure system?

Open systems are pot style boilers and I had no idea they were still in existence. They were popular back in the late 1800's before modern boiler technology came along. Any enclosed boiler is considered a pressure boiler since any water that is heated creates some pressure naturally in an enclosed system. As I said before I have no real idea how your system is supposed to work since all that stuff was way before my time. I have a lot of experience with one pipe steam from years ago which is a total loss system but not pot style hot water boilers. Good luck.