Put new heat exchanger in my gb142

hpap · November 21

After much discussion inside my head, I finally changed my 18 year old gb142 heat exchanger.

Much to my disappointment the spare I bought in 2019 was damaged.

The lower connection bent from ups handling. Supply House offered a replacement at a discount so I took them up on it, that also arrived damaged, so i picked up the replacement at supply house in s Jersey, and inspected before taking it.

Replaced the circulators at boiler, new heat exchanger piping out of boiler,

made new manifold out of some threaded brass and L copper, soldered with 95/5, reused sensors,gas train, and ignition parts.

All in at about $2500 and 2 days in the garage.

Going to run I heat mode only for a couple days then turn on dhw loop.

I have heat pump water heater as backup.

Going to be on top of heat exchanger service every 2 years. Here's hoping I get another 18 years.

mattmia2 · November 21

i was going to say spending that much on an 18 year old boiler made 0 sense, then i checked mod con boiler prices and notice they seem to have doubled since i bought one 6 years ago.

EBEBRATT-Ed · November 21

You basically have a new boiler as long as no issues with the blower and sensors etc. Not fun to change

hpap · November 21

Over the years, stocked up on sensors, a gas valve, a exhaust blower.

Inventory low on ignitors thou.

if you have it, never need it.

Don't have it, when you do need it, it's either gonna cost a fortune or be obselete! !!

psb75 · November 22

Wow. Seems like you have enough parts now to keep that boiler running for more than 18 more years. Keep the "crusties" out of the heat-x-er and find some igniters/flamerods and you're good to go for a long time. The black plastic venturi gets brittle over time. Blower/fan will eventually go. It is a good boiler. I have been servicing an 18 yr. old GB 142 for that many years.

hpap · November 23

Some pictures of inside heat exchanger, top pretty good shape, bottom rows fins are worn away.

Shame on me, I Have to admit, I never cleaned for 1 st ten years, amazing it lasted 18.

I'll keep on this one better, as I'm not sure I wanna stock a heat exchanger for replacement. If I could get one at discount, I'd do it perhaps.

I have to mention, I bought the return/ supply pipe connectors from heat exchanger to outside of the cabinet, old didn't come apart with a fight then a saw all lol.

The 2 PCs were 500 bucks ? but necessary.

Plus the 2 'dielectric ' compression fittings at 90 each. Old definitely not reusable.

mattmia2 · November 23

i'm not sure maintaining it would have helped, the aluminum is dissolving either way, you are just removing the dissolving part if you maintained it. maybe it dries faster and has less time to react it it is clean.

hpap · November 26

Tried taking the end manifold off old heat exchanger to move onto damaged new.

It's just not happening.

Guess scrap yard they both go.

Tried rounding out the 1 st replacement outlet/ inlet

Gentle as possible and it cracked.

Did inventory of parts

Turns out have gasket for larger 60kw boiler 67900522 bottom drain pan

And the one for top of ceramic plate / burner cover, no number.

And spare casing fasteners 7099834

Anyone interested hit me up on pm or hapaschold@aol.com

Thanks all

Happy Thanksgiving

hpap · November 27

Happy Thanksgiving All

Early morning tuning , water pH at 7.8

Co between 9 and 90 depending on fire rate, we'll below recommended 400.

Dialed in the taco dhw pump and boiler loop pump to medium setting, according to Taco flow rate matches Buderus suggested of max of 15 gpm

Hopefully good to go another 18 years !

GW · November 27

I hope the computer and controls keep going for you

hpap · November 27

Got a spare everything I think

Gas valve exhauster main control too

Probably missed something that'll be obselete

Put new heat exchanger in my gb142

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