waht is the working water pressure for a domestic heating system?
930002
A sealed (pessurised) system is normally about 1.5 bar. Open vented - depends on the head, 10 meters/ 33'  = 1bar
354143
increased pressure = increased heat
1011895
You will find this an interesting document:\nhttp://www.ewaonline.de/downloads/Barcelona_programa%20defi.pdf#search='dealing%20in%20the%20uk%20like%20of%20wat%20for%20water'
81103
http://www.google.com/webhp?complete=1&hl=en
487009
Imagine a column of water.  The pressure is higher at the bottom of the column because of all the water above it pushing down.  Now, a closed water system can be treated as a column for determining the water pressure.  You measure from the highest point that water is in the system down to the height of the place where you taking the measurement.  \n\nIf the water tower is 200 feet tall and the building is 90 feet tall, the people on the top of the building will have 110 foot column forming their water pressure.  People in the bottom of the building will have the full 200 foot tall column of water forming their water pressure.  \n\nBecause we are dealing with a fluid, the water can exert its force around corners and the column doesn't have to really be straight up and down.  It can even have u-turns and loops.  All that really matters is the height of the faucet relative to the water level in the reservoir.
948401
Energy required to heat 1liter of water:\n\nQ = V(liters) * d(kg/liter) * Cp(kJ/kg/K) * (Tfinal - Tinitial)\nwhere Cp is the specific heat capacity of water, which is temperature dependant but for which you can use an average value for the temperature range.\n\nQ = 1 * 1 * 4.18 * 73\nQ = 305.14 kJ\n\n1 kW.h = 3600 kJ\n\nQ = 305.14 kJ / 3600 (kJ/kW.h)\nQ = 0.085 kW.h\n\nPrice = 0.085 * 10 = 0.85 cents
113532
Most homes have indoor plumbing, electricity, and running water. Cable TV  and internet access are big ones too. I grew up with a LOT of people who didn't have electricity/water and that was in the 80s and 90s! Now, where I am from, about 75% have electricity and water.
431380
If the pressure is 0.76m of Hg, it is equivalent to 10.3 m of water. There is a vacuum in the tube above this water height.\n\nHowever, by “vacuum” we mean inside this space, the pressure is low. There will be vapour of water which will have some pressure.\n\nEven in mercury barometer, there will be mercury vapour inside the “Torricelli’s vacuum”.  \n\nThis is the reason that ordinary pump which sucks water from a well or sump is not able to lift water to a height more than 10m from the surface of the water.
1102378
hot water works for me
818902
You better read something on this:\nhttp://en.wikipedia.org/wiki/Pressure
710153
Usually psi (pounds per square inch).\n\nAloha
1034461
The advantages that you need not fill the water as and when you want to heat the water.\nthe heater is always full of water with the indication of green bulb and red.\nWhen the heater is working the green bulb glows.\nand the heater stops with the indication of red when the water is really heated to the set level\nDis advantages.\nIrrespective of the small quantity you want it makes the entire water load to get heated up.\nHeavy current consumption.\nMeans the increase in cost of electricity bill.\nIf at all you keep the water heater on for 24 hrs then the steam formation takes place on the top and when you open the tap you get steam for sometimes surging out of the out let pipe.
416718
Are any of you educated in science?\n\nBernoulli's Principle states that as the speed of a moving fluid increases, the pressure within the fluid decreases. It has absolutely nothing whatsoever to do with air pressure and temperature. You're thinking of either Charles's Law or Boyle's Law, but again neither have any relevence here.\n\n\nHow possibly can hurricanes affect the water pressure in Latin American countries? Don't they get hurricanes in the US and does the US have a water pressure problem?\n\nWater pressure, the hotter the air (also water) the lower the pressure, thats why hurricanes form in the carribean region ( they need moist{sea} warm air)\n\n\n\nThe next answer is actually theoretically correct, you do weigh less at the equator than at the poles, but the effect is small (0.5% weight difference) and certainly doesn't have a significant effect on the plumbing in Latin America. This is equivalent in a 10 storey hotel to raising the roof storage tank by approximately 6inches or 15cms to negate this effect:\n\nWell pardner, my guess would be that centrifigal force at the equator is greater than at areas further north and further south. The ideal launch sites for stuff being flung out into space would be close to the equator for the same reason.\n\n\nThe real reason as any competent plumber will tell you is a combination of the head of water (the pressure the water is being fed with) and the diameter of the pipes, smaller pipes allowing less flow. The pressure of the water is dictated either by the water supply companies who pump the water at a certain pressure (Mains pressure) or if the system is being fed from a tank, it depends how high above the tap the water tank is. Higher tanks give higher pressure, which is why a shower on the ground floor fed from a tank in the loft gives a better flow than one on the top floor.\n\nBasically, they've got rubbish plumbing and it's being fed either at a lower pressure by the utility companies or they are using smaller diameter water pipes, all probably compounded by general drinking water shortages.
328799
There is little mechanical consideration. All you have to do is have a water heater, a pump and a temperature sensor. The heater heats the water until the sensor says stop, its hot enough. The pump simply distributes the heated water evenly throughout the jacuzzi. You got to have evenly spaced hot water outlets in the jacuzzi.
631138
Water pressure is the force exerted by water on its surroundings.\n\nOne example is diving under water. At the surface, the air pressure is one atmosphere (atmosphere is a unit of pressure). If you dive 33 feet down, then the pressure is 2 atmospheres. 66 feet is 3 atmospheres, etc. This means, under 33 feet of water, the force exerted on you by the water is double the pressure of air at the surface (which you don't notice because you're used to it ... you only notice when it changes, such as when you go in an airplane and your ears pop).\n\nAnother example is in pipes. Water is pressurized so that it will flow out of your faucet when you open the tap. The air pressure at your sink is one atmosphere. As long as the water in the pipes is pressurized more than one atmosphere, water will flow when you open the tap.
316108
It depends on the purity of the water and the pressure of the system.  Pure water in normal atmospheric pressure boils at 212 F.
37324
http://www.hvacplus.com/Bryant-471.html\n\ntry this