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    Mobile home furnace recommendation?

    My 42 year old Miller MOC-80 became a casualty of the recent cold snap. Emergency service guy said the heat exchanger was clogged with soot, and the last time he tried to clean one, he wasn't able to...
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    Good question, Tom. Do they really make expansion...

    Good question, Tom. Do they really make expansion tanks without bladders, or are you thinking some other type being misused?

    Wouldn't the air in the tank be absorbed by the water, just like in an...
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    1st of all, I think you might have your mords...

    1st of all, I think you might have your mords wixed. The reducing valve and PRV (pressure reducing valve) are the same thing. Do you mean the TPR (temperature & pressure relief) valve is the one that...
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    3/4" PEX and 1/2" copper have comparable inner...

    3/4" PEX and 1/2" copper have comparable inner diameters.

    I've seen drinking straws with more space inside than 1/2" PEX. Single fixture use only.

    IMO, and a lowly DIYer, but I think you want...
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    That's really dependent on the particulars of the...

    That's really dependent on the particulars of the hardware you've got and how exactly they bolt to the wall and/or each other.

    Just think of it as a jigsaw puzzle with the picture missing from the...
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    If the whacking sound has a "clang" in it as...

    If the whacking sound has a "clang" in it as well, then yes, those could be hitting there. Is that near the pipes into the heater?

    If it's within reach, you could try stuffing some foam or cloth...
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    Insufficient resolution for a conclusion. If you...

    Insufficient resolution for a conclusion. If you want to be sure of what you're going after, you need to pinpoint the sound.
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    cacher_chick's suggestion is as excellent as her...

    cacher_chick's suggestion is as excellent as her tagline, but bear in mind it makes the assumption that the problem is indeed hammering resulting in pipe movement resulting in an audible banging...
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    That'll change when you replace that boiler with...

    That'll change when you replace that boiler with a newer high efficiency unit after it croaks from all the short cycling.

    Really, no amount of insulation is *that* awesome, even at...
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    Incorrect is a little severe. I'd say he just...

    Incorrect is a little severe. I'd say he just went cheap. Whether that matters depends on what that pipe is serving. If it's low flow, no big deal. If it's a bathtub, it might reduce the flow rate....
  11. This. The only wire that sucks worse than...

    This. The only wire that sucks worse than aluminum is old aluminum. Tearing all your walls open might not be practical, though.
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    I can think of one other application where I...

    I can think of one other application where I might favor PEX: a rarely occupied structure, such as a vacation cabin, due to its improved tolerance to freezing. Sure, the water still freezes, but the...
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    Hammering *everywhere* is a little bit suspect,...

    Hammering *everywhere* is a little bit suspect, IMO. It's only commonplace where fast-closing solenoid valves are involved, or when you turn a valve quickly from max to zero.

    I think your first...
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    AFAIK, all the potential problems are...

    AFAIK, all the potential problems are alcohol-related.

    I've heard of people messing up opening the drain cock and causing the entire contents to leak out.

    I've heard of people turning the...
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    Black and galvanized are non-starters, as is hard...

    Black and galvanized are non-starters, as is hard copper pipe. I've recently learned that no fittings of any kind can be inside a foundation slab, and I'd assume the same rule applies to a 2nd floor...
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    PEX is vulnerable to rodents' teeth. It's also...

    PEX is vulnerable to rodents' teeth.

    It's also got much thicker walls, resulting in crappy inner diameter and thus higher water velocity for the same flow rate, magnifying any unarrested water...
  17. That sparking bothers me. I think one of two...

    That sparking bothers me. I think one of two things must be going on;

    1) some other circuit is so badly miswired it's sending return current down another circuit's neutral line. if this is the...
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    Same as the static system pressure, that is, what...

    Same as the static system pressure, that is, what the gauge reads when nothing is flowing, is what I've been reading.

    Since street pressure varies through the 24hr period, it seems to me a...
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    Not that I don't agree that it's ugly, but what...

    Not that I don't agree that it's ugly, but what would be the profit in bothering to replace it at all? In what way is it functionally deficient?

    Generally, whether PEX or copper, I do like the...
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    hj, could you clarify? It's not obvious to a noob...

    hj, could you clarify? It's not obvious to a noob how strictly "connection" is defined.

    Does that mean it has to be copper flex where it goes in the slab, or are ells and bends allowed to support...
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    Please, educate us about why exactly it's...

    Please, educate us about why exactly it's necessary and proper to install a manifold so far out of plumb/level that it looks like the job was done by a blind one-armed man during his lunch break....
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    I'm going to side with Dana on this one. 16' is...

    I'm going to side with Dana on this one. 16' is definitely way too short, since the math says that 50' itself is already too short.

    Unless, of course, your goal is to fry your boiler and get the...
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    You haven't altered the pressure squat by partly...

    You haven't altered the pressure squat by partly closing a ball valve. You've limited its maximum flow rate somewhat, though. I'd imagine shower pressure sucks if you try to take one while the DW or...
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    I've already bought and started to rough fit the...

    I've already bought and started to rough fit the polyiso, so the options are keep the facers or peel them off.

    I went with this stuff because it's the only way to get anywhere near R13 (12.2 i...
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    Just to put a bit more science behind what Jim...

    Just to put a bit more science behind what Jim and Terry are saying.

    Water, like any other matter, possesses momentum when it's moving. Turn off a valve, and that column of still-moving water in...
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