Search: Posts Made By: xiphias
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Replies: 4
Views: 1,351
Posted By xiphias

The GB142 has a built in ODR control. I think...

The GB142 has a built in ODR control. I think Buderus offers room sensors that interface with the boiler control so it gets info about current room temperature not just outdoor temperature. That can...
Replies: 9
Views: 2,021
Posted By xiphias

That is called a 'diverter-tee' or monoflow...

That is called a 'diverter-tee' or monoflow system. Not in vogue any more. Many reasons. Not worth getting into here.

The half-inch piping is most of the problem. Too much head (resistance), low...
Replies: 18
Views: 2,087
Posted By xiphias

A full-on assessment requires a "blower door...

A full-on assessment requires a "blower door test" and thermal IR imagery from a building diagnostics person. This is literally some of the best money you can spend on your house. They generally take...
Replies: 8
Views: 1,458
Posted By xiphias

At a minimum, get it thoroughly cleaned and...

At a minimum, get it thoroughly cleaned and inspected. Your flue gas temperature will be a lot lower with gas. Possibly will condense in chimney, in which case almost any- and every-thing that can...
Replies: 8
Views: 1,721
Posted By xiphias

OK, so what is the temperature drop supply to...

OK, so what is the temperature drop supply to return?
Replies: 8
Views: 1,721
Posted By xiphias

OK. Had to ask. We get all kinds here.... ...

OK. Had to ask. We get all kinds here....

300 ft of 1/2 pex is 10.5 ft of head at 1 gpm. 21.3 ft of head at 1.5 gpm. I forget how to do the calc for 8 loops on one zone. A NRF-22 could push one...
Replies: 8
Views: 1,721
Posted By xiphias

Questions: Size of tubing? How many...

Questions:

Size of tubing?
How many loops?
Length of each loop?
Design water temperature and temperature drop?
Oxygen barrier pex?
Slab insulation detail (perimeter, under)?
Floor...
Replies: 2
Views: 1,000
Posted By xiphias

Lots of good steam guys in Boston. Call around....

Lots of good steam guys in Boston. Call around. Anybody who has taken one or more of Dan Holohan's steam courses, and/or memorized his books on steam, would be someone to have in for a look at the...
Replies: 42
Views: 5,214
Posted By xiphias

E. which is D plus put it on the list for next...

E. which is D plus put it on the list for next 3-5 yr to cut out the affected sections and replace with copper, or do A.

B is too complicated and introduces a whole 'nother set of stuff that needs...
Replies: 3
Views: 1,177
Posted By xiphias

Glycol does not like to be superheated, which is...

Glycol does not like to be superheated, which is what you want to do with concentration via parabolic mirrors. (In fact, solar concentration is really good for doing things like running a steam...
Replies: 11
Views: 1,573
Posted By xiphias

The place to start in all this is with a real...

The place to start in all this is with a real building diagnostic consultant. Identify how the building envelope can be improved and make a prioritized plan to start doing it. Insulation,...
Replies: 21
Views: 4,722
Posted By xiphias

You have a jet engine (big boiler) strapped to a...

You have a jet engine (big boiler) strapped to a canary (low heat loss house). Or some other clever metaphor.

Trooper is correct that the middle Siggy diagram is the proper way to pipe your...
Replies: 42
Views: 5,214
Posted By xiphias

You could ask tekmar, and/or ask your local...

You could ask tekmar, and/or ask your local distributor, which the tekmar site says is Fluid Industrial Associates in Walpole. They once sent me a very nice diagram for my system when we hit a "do it...
Replies: 58
Views: 7,420
Posted By xiphias

Oh, that check. Yeah, need rbeck. I would...

Oh, that check. Yeah, need rbeck.

I would install the bypass. Always nice to have the option if you need it. Which as you note, probably not.
Replies: 58
Views: 7,420
Posted By xiphias

I see only one check on the indirect piping in...

I see only one check on the indirect piping in that diagram. Remember the incompressibility of water. If the check is stopping the flow, it's not like 'extra' water is somehow piling in there.

You...
Replies: 58
Views: 7,420
Posted By xiphias

Some reasons to go with a dedicated circulator...

Some reasons to go with a dedicated circulator for the indirect. Not all apply in this installation.

- match the required flow rate for the indirect to help achieve rated performance.
- avoid...
Replies: 58
Views: 7,420
Posted By xiphias

Definitely use a dedicated circulator for the...

Definitely use a dedicated circulator for the indirect. The boiler probably comes with a 007, which should be fine.

1" piping should be fine, but nothing wrong with 1.25" either (personally, I'd...
Replies: 37
Views: 23,582
Posted By xiphias

A 60-80k modcon can do a reasonable dT across the...

A 60-80k modcon can do a reasonable dT across the boiler and handle a circuit with 20-30F temp drop. Say 100 gallons in your system not a huge big deal. This is actually very common and an ideal...
Replies: 37
Views: 23,582
Posted By xiphias

What furd said. A tankless coil (Trooper and...

What furd said. A tankless coil (Trooper and others often call them 'thankless coils') requires warm-start, which as noted is an incredible waste of energy.

The required gizmo is called an...
Replies: 3
Views: 1,515
Posted By xiphias

That is a commercial boiler. Smallest size is...

That is a commercial boiler. Smallest size is 300k BTU/hr. That would run about 6 houses in my 'hood.
Replies: 58
Views: 7,420
Posted By xiphias

The relatively high lower limit of oil-fired...

The relatively high lower limit of oil-fired boilers has to do with how low you can push the combustion and still get stable flame, etc.

Buderus makes very good oil-fired equipment. The G115WS/3...
Replies: 58
Views: 7,420
Posted By xiphias

Sweet. Buderus makes very nice stuff. IMHO,...

Sweet.

Buderus makes very nice stuff. IMHO, however, their modcon (GB142) leaves a bit to be desired. Namely, it has an aluminum block rather than stainless. Very sensitive to water chemistry. The...
Replies: 58
Views: 7,420
Posted By xiphias

There was a whole discussion here recently on...

There was a whole discussion here recently on propane as a fuel source. I forget which thread. I'm not going to revisit that.

Some suggestions.

Look at the more open heat exchanger designs that...
Replies: 18
Views: 2,087
Posted By xiphias

I'm with Peter. An MPO with a 20-30 gal indirect,...

I'm with Peter. An MPO with a 20-30 gal indirect, outdoor reset with domestic hot water priority would be a fine system. Burnham has their "IQ" package with those ODR and DHW functions, or use a...
Replies: 37
Views: 23,582
Posted By xiphias

4) NEITHER. There is already a ton of fudge...

4) NEITHER.

There is already a ton of fudge (about 20-30%) in the Manual J heat loss calculation. Warm start is an incredible waste of energy. There is really no point in having a boiler who's...
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