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luis1578 · Nov 23, 2009, 05:55 AM

I'm having a problem with getting enough heat in the back bedroom. I have baseboard heat, with hot water. I have bled the system and checked the circulating pump wich are fine, it is a single zone system. The only problem is that back bedroom, Is 1/25 hp for a pump OK? And is the pump on the return line OK? Thanks

hvac1000 · Nov 23, 2009, 11:29 AM

Pump size needs to be calculated during the engineering of the job so that item I could not tell you except a 1/25 HP is small but if it worked at one time it should work now.

The pump will work on supply or return but I always like to pump away from the boiler.

Check your water operating pressure. It should be around 12 psi for a one floor plan system.

luis1578 · Nov 23, 2009, 11:36 AM

The pressure is at 12 psi, the problem is that I don't know if this problem is exsisting. I just moved in over the summer. The pump is on the return pumping into the boiler. I was under the impression it should have been after the exp. Tank on the supply line not into the boiler. Can I add an extra pump at the end of the floor?

hvac1000 · Nov 23, 2009, 12:04 PM

My expansion tank is on the return side. There are many engineer drawings that show the pumps and expansion tanks on different sides of the boiler so since it is all one system it really does not make a difference. This have be argued before and all professional boiler people have there own opinion.

Since you just moved in and you really do not know what the problem is then you can start tossing money at the problem or have a professional do a on site survey of your problem and effect the cure. Anything on this board will be guess work since we cannot see the entire system.

If the baseboard is not getting hot at all then the hot water is not reaching the base board. Item to check

Make sure all valves in the hot water line ore open and that no thermostatic controls are in line stopping the flow.

Next try to increase the water pressure 2 to 3 psi to see if that forces the water to the baseboard.

Next since you do not have a flow meter or a way to judge the water flow in GPM you could install a slightly larger pump to see if that eliminates the problem BUT I would not just add a pump to the system since the added pump will need to be controlled by something and that will cost you extra bucks. Just replace the pump you have. Here again all this is just guess work and the guess work can and will cost you some $$ to do.