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the boiler intake(return) and output(supply) water temps after a run of indirect water heating WILL be hot, ( it will be the temp of the dom hot water.) much hotter than the space heating water temp, esp, as you say, on mild days. So when your boiler starts to draw in space heating...

maybe it's not natural gas from your pipes. spilled gasoline, car leaking some fluids,other petroleum products, maybe

no glue/sticky arrangement can work, since the water is under pressure and will remove the glue as it leaks out. what's wrong with the bucket approach till spring,then you emptythe pipe and fix it at your leisure

indirect is best for efficiency, long life, no need for flue. overall, your best water heater option by far

the heated water in you tank naturally tends to rise, and some rises up into your cold entry pipe. it's not radiating from flue vent hood. no danger or problem from this, but you lose some efficiency as the heated water cools off. there are piping techniques to counteract this, but...

normally a normal system loses a tiny amount of water, which you refill maybe once a month or so. if there is a leak, i think you are better off knowing about it. otherwise a hidden leak could go on forever, with automatic refill ,and rot your joists etc,

there a 2 schools of thought on this: if you automatically refill your system, the homeowner may have a leak and it could remain undetected, with replacement water( with its own oxygen supply,which is bad) taking care of keeping sysyem filled. if no auto refill,then a leak means your...

are you sure all the valves are fully open? if one of your shut off valves is only partially open ,youwould have full pressure when no flow, and reduced pressure when flowing. it is also easeir to open a valve than to replace pipe!

your 45 to 65 is typical, i think 80 psi is considered too high and will damage fixtures

temperature cold is the enemy of PE. when it's 90 degrees, and it's been laying in the sun for a few hours, you have a completely different, friendly product. But even then, you won't make those sharp 90 degree turns. wait till July

one sec of air is nothing, either the air block is some trapped elsewhere, or it's not an air problem. Radiator capped off: did this immediately precede the circulation problem? normally they are in parallel, but if you happen to have a series piped system, you may have shut it all down.

yes, bleed every radiator. If air is the problem, you will find a lot of it in them. if you don't get a lot of air out, then you have another problem. the boiler properly shuts itself off since the water is too hot. Once the water hits 190, you dont want it heated anymore. Your challenge is...

are you sure it's oozing out of the brass (which means porous, and need to replace) as opposed to condensation( bcs. valve is colder than the air in the room)? Could tape on some alum. foil ove the leak, and see where the water is> that will answer the above question,if you aren't sure

you might have a slow-operating or non-operating automatic bleeder. If you can work fast, you might be able to replace it with a manual bleeder, and that may be all you need to do

there are 2 separate issues:' is the air out of the system, answer: yes. two is there any fwATer flow thru the ratidator, no. The supply valve may be shut( that will still allow air to be bled bcs water would push up the return.) or any other flow blockage

Irrigation sprinkler supply houses sell a tapered serrated insert, you jam it into the stuck nipple, and twist it out. doesn't always work,though. Plastic that's repeatedly heated like that has a short life span. You might need new water heater.

My I and O manual gives you both options: p/s, with dhw operating as a zone, or alternatively, you can pipe the indirect right off the primary circuit, with a Tee . That has either one pump or other running, and that gives DHW priority over space heating

i have lochinvar 105 w indirect, also. I believe the circuit board expects the dhw pump to be in series w the boiler and the indirect, and therefore the dhw pump will give the boiler all the flow it needs. or, if no dhw call for heat, then the boiler pump supplies the boiler, that is...

Pressure in the pipe is governed by pressure of the supply, and the rate of flow thru the pipes. When no water is in use, pressure is same throughout the entire system, turning valves has no effect. At very low flow rate, valves have minimum effect. For two inch pipes in a typical...

no, gate valves also should be all open or all closed