Laars HQ-1100 installed around 1985 and a Turbotax indirect

Steve_210

Hi Guys, I have a Laars HQ-1100 installed around 1985 and a Turbotax indirect. The pressure on the heating side is only between 12-15lbs so I know there's no domestic water getting into the heating circuit. Pump is properly sized for a boiler and indirect, but boiler is overheating as the heat exchanger is plugged up. You can see some of the rust particles I've removed from the heat exchanger in the picture. I'm just wondering if anyone has had any success cleaning these heat exchangers. Especially on something that is 30+ years old. There are 2 identical units with (2) TUrbomax for an apartment building. Looks like they were installed roughly the same time. One is working, one runs for a few minutes and then starts to make a lot of noise (over heating). There is a flow switch and there is enough circulation to operate the flow switch. Again, looking for advice on cleaning out the heat exchanger. I am trying to determine whether it's worth the time and effort or if I should just tell them to replace the boiler. Any advice greatly appreciated. Thank You

jumper

turbotax?

Bob Bona_4

Replace boiler.

Steve_210

They have opted to try and clean the heat exchanger
Any advice

lchmb

make sure you dont warranty it in anyway.. tried it twice...both leaked within a week...

HVACNUT

A 1985 system, the best way to clean that heat exchanger is with a Sawzall and a hand truck.

Steve_210

Thanks

Steve_210

Turbomax sorry