The returns are cold enough to condense the moisture out of the warmer air moving through them. It is costing you a lot too in heat loss into the crawl space and loss of the humidity needed inside the house to make you feel warm and toasty. It is just like the water that condenses out of the air onto a glass of Ice tea. Insulate those air returns and supply lines. In really cold weather close all vents into the crawl spaces. It will cut your heating costs and maybe save your water lines from getting frozen and busted. Get a humdifier guage and keep your winter house humidity 45-50 percent even if you have to boil water or leave the hot water in your tub a while.
Absolutely. Moisture from the ground (or even concrete floor as water seeps through) will rise up and saturate the crawl space area with moisture. Anything organic in the space- including wooden beams and insulation- runs the risk of growing mold and rot, eventually affecting the structural integrity of the home and overall healthiness. Additionally, termites can enter and devour the moist wood, and mold spores will rise into your home. (This is much more common than many people think- warm air exits out of the upper levels and cool air is sucked up through the crawl space). Unsealed crawl spaces will also bring humidity into the house and be a perfect place for rodents to live and die in. Definitely put something down. And if you have a vented crawl space, you should look into sealing those vents if local housing codes allow for it.
A thermally controlled mixing valve is connected between the hot supply line and the return line, tempering the hot supply with the cooler return water.
it allows the water to flow in only one direction.
It is the small space between two plates having water and at the other side of the plate hot gases are available to transfer heat to the boiler water. In fire tube boiler space between end plate and combustion chamber's end plate is called water leg.
Lag
Control the water and you control the mold.
Any water lines in a crawl space that don't have insulated walls should be insulated unless you live in climates that temperatures don't go below freezing (32F). I recommend that you use all the inside walls as much as possible for your water lines. You can also insulate your crawl space walls then you shouldn't have a problem on your non insulated water pipes as long as your crawl space is below your frost line. In colder climates its against code to plumb water lines in exterior walls.
There is no such thing. - You may mean a "crawl space" -this a space under the floors of many wood built homes to enable access to water and electric services. These crawl spaces are usually 2-4 feet high and are very common in north Amrican houses.
I would guess that despite the sealing job you did, warm air from the living space has found it`s way up and into the return air duct in the colder attic and condensed.
Use a search engine online and enter the term, crawl space. That will direct you to a professional company that specializes in crawl spaces. You have 2 problems. Let's discuss the crawl space first. Water can not be stopped. It can be diverted properly so it does not end up pn the top of your crawl space. Waterproofing a crawl space is done from inside the crawl space. Trenching around the perimeter, installing 4 inch perforated drain tile. Connecting the drain tile system to a sump pit and a sump pump which will the eject the water properly to the outside thus eliminating your problem. Your yard is a total other aspect. A few suggestions: Your gutter down spouts should extend 6 feet away from your home and hopefully run down hill. If your yard has a lot of standing water you will need to make the area nearest your house the high ground so the water can run down hill using gravity so the water can puddle up as far from your house as possible.
If a hot water pipe is leaking then it will definitely affect the amount of hot water you have, -This is costing you a lot in heating, get it fixed ASAP
His tear ducts were damaged in the explosion. Underground water is moved into the city through the aqua ducts.
The most frequent cause of crawl space odor is moisture, and a common culprit is improperly designed and installed vents, which can allow rainwater to find its way into the space. Replace or repair leaking vents.
Something non flammible
Yes, well sometimes not always. They crawl when they are slipping into the water.
The aqua ducts brought in the water.
Depends on your basement area. They help divert water that could add excess moisture into your basement or crawl space.