Upgrading a Cast Iron system

Alex_9

I am in the process of upgrading a hot water system in a house that is 100 yrs old. A radiant heating system has been installed in the basement floor. The rest of the house has a cast iron and galvanized pipe system. The installers have changed over the pipes in the basement, on the cast system, to a plastic tubing that is 1/2" ID. These connect to the original galvanized 1 1/4" ID in the rest of the house. the new system has three pumps. One for the radiant floor, one for the house & one on the boiler (80% efficient nat gas). Th radiant and the house are on separate thermostats.

Is there any potential heating problems with this system in regards to good flow through the system, paricularly in relation to the ID change from wide to narrow and to wide again?

Steamhead

Probably not

the old pipes were big because when the system was originally installed, there was no pump. Water circulated by gravity thru the big pipes. If your new piping was properly sized for forced circulation, you should have no problems getting everything warm.

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