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Re: LP smaller diameter = higher pressure/BTUs? True??
@yellowdog sigh..... Okay, you win. I will just go ahead and start over with the miles of gas systems I've designed and installed over my career because some guy on the internet says they don't work. Perhaps I'll venture out to the 400k boiler behind my shop and 199k tankless inside and tell them that they can't work with the 240ft of 1/2" copper run from my tank to their 2nd stage regulator. YOU may size however you wish, and sizing with a 1# drop is most certainly a conservative approach that'll always be adequate. The reality, however, is that this 1/2" line at 10 PSI from the first stage reg will easily flow double what the OP is asking of it. Bigger is better, sure- but it is absolutely NOT necessary.
GroundUp
1
Re: Taco Circulator pump, I think I need to change it out
It's a good idea to replace any automatic air vents whenever you have to drain your boiler for repairs. If you don't replace them then you run the risk of one or more zones becoming air bound after the fresh, oxygen rich water is heated for the first time.
Re: Dry contact thermostat
Most thermostats that have a separate Rh & Rc terminal will be dry between Rh & W; they take power from the Rc & C terminal.
I use & recommend the Honeywell 8000 series. It's available in a RedLINK wireless version that supports wireless sensors (& internet access via a RedLINK gateway) and a straight WiFi version that does NOT support wireless sensors (but can use wired remotes).
ratio
1
Re: Header, because
Those Slant Fins make very dry steam, I suspect due to the unique internal path of steam in the boiler through the full depth of the really wide end section and the internal baffling. Also really easy to get a good skim. Probably the best Cast Iron boiler design on the market.
Re: Steam Radiator ID
"Pierce". It was made by the Pierce, Butler & Pierce company of Syracuse, NY. It's a standard column-type radiator that was made up till about 1926.
Re: Viessmann 4-Way Mixing Valve
do you even need a mixing valve, what temperature does the fin tube need to meet the load? Run the boiler on reset for the required radiant temperature, DHW on priority
If you could run just one lower temperature, below 130 the boiler efficiency jumps. Beef up the fin tube to run at the radiant SWT
I think you can plug a port on a 4 way, but it will require some repiping. Doesn’t that boiler have multiple temperature output in the control?
If you could run just one lower temperature, below 130 the boiler efficiency jumps. Beef up the fin tube to run at the radiant SWT
I think you can plug a port on a 4 way, but it will require some repiping. Doesn’t that boiler have multiple temperature output in the control?
hot_rod
2
Re: Loop seal on condensate tank??
Any traps that drop into the wet return upstream of the loop seal should be vented....a vent installed after the traps. Weather you need multiple vents or one vent depends how it is piped.
They make boiler feed tanks wher you dig out the floor and they sit flush wit the top of the floor. That is probably what should have been used unless the condensate pipe can be raised to that the air removal can be done by the tank vent which is usually the case.
They make boiler feed tanks wher you dig out the floor and they sit flush wit the top of the floor. That is probably what should have been used unless the condensate pipe can be raised to that the air removal can be done by the tank vent which is usually the case.
Re: Mixing under-floor radiant with wall panels okay?
What temperature are you running to the radiant?
You can run up to 3 panels on a 1/2" circuit, generally. Depends on the size.
Any idea how much additional you need to add?
If so, use the output chart, at the temperature you can supply to see how much BTU/ hr they will add.
Maybe place another manifold at the boiler and run to the radiators.
If you want each radiator on its own TRV, consider a homerun. 1/2" pex to each radiator
You can run up to 3 panels on a 1/2" circuit, generally. Depends on the size.
Any idea how much additional you need to add?
If so, use the output chart, at the temperature you can supply to see how much BTU/ hr they will add.
Maybe place another manifold at the boiler and run to the radiators.
If you want each radiator on its own TRV, consider a homerun. 1/2" pex to each radiator
hot_rod
2
Re: Low Loss Header vs Closely Spaced Tee's for efficiency
Depending on the llh you chose, you can get multiple important functions, air separation, dirt separation, magnetic separation in addition to hydraulic
The blending of the temperature, if any, is based on the difference in the two flow rates. The size of the container doesn’t change that
That temperature blend happens in either case. A sep does add a bit of buffer also. Sometimes the sep hold more water than the boiler😚
The blending of the temperature, if any, is based on the difference in the two flow rates. The size of the container doesn’t change that
That temperature blend happens in either case. A sep does add a bit of buffer also. Sometimes the sep hold more water than the boiler😚
hot_rod
1
Re: What is the future of Hydronics?
define hydronics 
For me any fluid based system, boilers, solar, radiant, chilled water cooling, snowmelt, geo thermal, district systems, probably even put steam in that group. Domestic water recirculation is a hydronic loop, flow rate established by the heat loss of the loop.
Power plants need hydronics for cooling.
Commercial buildings will always have the need for hydronics to heat, cool, create DHW. VRV is not going to talk away all that market.
A2WHP are breathing some new life into hydronics, being fluid based systems. I would certainly get up to speed on that technology, both the unit itself and the proper applications for them.
Boiler sales have plunged around the world, but all the major boiler manufacturers are putting 10's of millions into HP development. Keep an eye on the players and opportunties in that technology.
For me any fluid based system, boilers, solar, radiant, chilled water cooling, snowmelt, geo thermal, district systems, probably even put steam in that group. Domestic water recirculation is a hydronic loop, flow rate established by the heat loss of the loop.
Power plants need hydronics for cooling.
Commercial buildings will always have the need for hydronics to heat, cool, create DHW. VRV is not going to talk away all that market.
A2WHP are breathing some new life into hydronics, being fluid based systems. I would certainly get up to speed on that technology, both the unit itself and the proper applications for them.
Boiler sales have plunged around the world, but all the major boiler manufacturers are putting 10's of millions into HP development. Keep an eye on the players and opportunties in that technology.
hot_rod
3