My wife decided we need a new furnace last summer. So she contacted a company that was recommend by a friend. We had a old cast iron fuel oil boiler. They came in and said, you need a 110000 BTU to heat this house. Are house is roughly 3000 sq ft. The old boiler always kept up no matter how cold it was. With the new one when the temp went to sub zero the warmest we can get the house to was 58 degrees. They came out on Friday and said its working good now by increasing the pump speed. That did not help. They came out of Sat and said the thermostat were bad. I replaced 3 of them, didn't help. They came out yesterday worked on it for 5 hrs, changing lots of setting. Didn't help at all. Wife called another heating company, they came out. First thing the guy says is this system is to small and not designed to heat a house this size. Then he asked about the old boiler, if that kept up. I said no problem it would cook us out.

We had a Navien Combi-boiler put in. Both domestics hot water and heat boiler.

Any heating guy have any advise??

Was old boiler hot water or steam? Old steam boilers were magical instruments.

Make them upgrade to what you need.

This^^^

This sucks but I've been hearing of similar problems the past few years.

Hot water, we have the baseboards. Not the big cast iron heaters.

What was the btu rating on your old boiler?

Was the new one approved by Biden ?

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GI Don’t want Joe

Are lines circulating......and not air locked? If circulating, is first radiator in the loop hot and they progressively cool off......or never hot enough to heat in the first place? As in boiler can't heat the water fast enough? How many pumps and loops?

Not a heating guy. Just have an oil fired boiler and baseboard heat, so is the boiler running all the time? If so the boiler is too small in my opinion.

Back in time when we got weeks of -50f my boiler would run a lot but not constantly.

I cant find a BTU rating for old boiler. The heating guy says the new boiler is running at 25 percent. I said if that true were only using 27000 BTU's to heat the house. The pipes coming up to and going out of baseboards are hot and the fins are luke warm. They have tried both speeding up the pump and slowing it down. The set temp is at 180 degree F. I have never seen it get to top temp. Its normally running at 165 to 175F

There is a canister on the floor to bleed off any air in the system. There is only one pump and 3 zones. All 3 have there own thermostat.


The guy last night said we could get a regular hot water heater and use it to keep heated water in and circulate . I dont know if thats is possible.

The second opinion you received was too small boiler and that was it or did he try to get the boiler up to working correctly. Seems to me that there is a problem with the burner controls. Is there any burner tune up guys there that you can get advice from?

Auto bleeder or manual?

Glycol or water?

Get the idiots that installed the thing to make it right.Mess around with it on your own and they will say you voided any warrenty.

You shouldn't have to do all this checking. BUT go to NAPA and purchase an inferred temperature reader and know the actual temperature it would help to know beyond feeling the pipes. They aren't expensive. The bleeder might be automatic and not working and there could be an air lock. But the boiler not reaching operating temperature is a clue to the problem if I understand correctly..

Your right but they can't so he had to come to the Ex-Sperts.

That's when its time to call consumer affairs and the better business bureau.It their job to take care of stuff like this.

Have you checked your fuel consumption ? Do you know how much you started with ? Is the boiler getting enough fuel ? Is there a restriction in the line or a filter that is clogged ? Are you burning #1 fuel oil ?
I, as others, suspect the unit is undersized if everything is functioning as it should.

If it ain't broke.
But hind sights 20-20

Auto bleeder

Glycol