Condensing boiler supply return

Gordy

In looking at the different brands of condensing boilers. I have noticed that the size of the supply/return connections are different. My system has 1 1/2" supply/ return piping which is reduced down to 1 1/4". Should this be a factor in selection. I see The munchkin has 1 1/4" Tappings, but most have 3/4" or 1".

Or are we talking different piping strategy, for smaller tappings?

Would the smaller tappings effect system flow? My system is ceiling radiant parallel piped.

Thanxs for advice Gordy

Constantin

From the looks of it,

... this is not the original boiler in the house... Thus far, the 1¼" connections when used in conjunction with the proper pump have worked well, right?

You could consider uncoupling the heating zones from the boiler using a low-loss-header, hydraulic separator, or whatever the various manufacturers want to call it. Radiant engineering makes a very nice stainless one, Caleffi make some, and Viessmann also, among others. That way, the restrictiveness of the HX's found in many condensing gas boilers are no longer an issue WRT system design.

That's a neat emitter system you have...

Al Corelli

It looks like the supply and return are piped into some kind of "device".

What is it, and how does it work?

Please.

Al Corelli

It looks like the supply and return are piped into some kind of

> ... this is not the original boiler in the

> house... Thus far, the 1¼" connections

> when used in conjunction with the proper pump

> have worked well, right?

>

> You could consider

> uncoupling the heating zones from the boiler

> using a low-loss-header, hydraulic separator, or

> whatever the various manufacturers want to call

> it. Radiant engineering makes a very nice

> stainless one, Caleffi make some, and Viessmann

> also, among others. That way, the restrictiveness

> of the HX's found in many condensing gas boilers

> are no longer an issue WRT system design.

> That's a neat emitter system you have...

Guy_6

Boiler piping

The piping on the different brands of boilers are based on their specific flow needs. Variances in the heat exchangers and differences of engineering opinions are what dictate the pipe sizing. Usually, the smaller piped boilers run higher deltas with higher head (push) pumps.

Gordy

Constantin

Yes you are correct original gave 43 yrs. service. This one was installed in 93. Nothing wrong with it, but its time to get economical. The pump is a little over sized I believe B&G HV, But it does work fine. The whole ceiling radiant emmiter system was parallel piped.

Gordy

Al

I think what you are refering to is the Taco mixing valve (original).

Gordy

reverse angle

Al here is a reverse angle to see the boiler bypass piping into the Taco mixer.

Al Corelli

Thank you. I did read that it was a ceiling radiant job, and should have known it was a mixer.

Sometimes, my brain doesn't comprehend as fast as my eyes.

And it ain't getting any better as I grow older.