No water pressure in heating circuit


It sounds like you fill valve is not properly set, or has failed. Do not run the furnace until you are sure the system (boiler shell, circulating pipes, and radiators) are completely filled with water.

If the water level in the boiler gets too low the system could be damaged. Boilers usually have a fuse plug that limits the damage if the water level fails, but that plug cannot be reset and is expensive to replace.

A typical circulating hot-water heating system has an automatic fill valve connected to the house water supply, which admits water to the system until the pressure rises to a preset level. (Usually the level is set to match the total height of the system.) This valve can become blocked by a tiny amount of shmutz in the supply line.

Sometimes you can clean and reset the automatic fill valve but sometimes you have to replace...

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I have a natural gas hot water furnace and I can't get heat. First I turn up the temperature at the thermostat and I hear the furnace turn on, the supply line gets hot and half way down the line it stays cold. I tried getting the air out of the line but now I have no water pressure. I don't know if the pressure was at 0 before I even started.

This picture shows a typical gas-fired, hot water furnace system:

The black thing in the center is the recirculator pump. When the furnace runs that recirculator is supposed to run. If you touch it or put your ear to it, you should detect it running. If it is making no noise, or is buzzing, then it needs to be replaced.

Tyler Durden
January 20, 2016 22:48 PM

It sounds like you fill valve is not properly set, or has failed. Do not run the furnace until you are sure the system (boiler shell, circulating pipes, and radiators) are completely filled with water.

If the water level in the boiler gets...

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Ans: When you use the term positive potential that relates to more positive charge; when you say negative potential, that relates to more negative charge. Potential is the amount of potential energy per unit charge in a field at a specific point. Potential energy is the amount of energy overall for a charge in a field. Energy cant itself be plus or minus, as its a scaler, but because potential equals energy / charge, and charge can be plus or minus, so can potential. If you draw a round circle and put a plus in the middle, you can say that's a positive charge, and draw arrows away from it going outwards radially. The arrows relate to the direction a positive charge would be pushed if it were in the field created by the positive charge. If you do the same for a negative charge the lines arrows go towards the charge. This again show that electrons will move to a more positive potential, since they will move in the opposite direction of these arrows. Now, with gravity for example,...

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Video Transcript

Hello, everyone. I'm Joshua Clement, and today I'm going to talk to you about how to fix no water pressure in your hot water heater. Now there's only a couple things that will prevent the water from flowing through your water heater and reducing that water pressure. One of those is your shut off valve. Your shut off valve is designed so that way you can shut off the water and work on your water heater. A lot of times there's corrosion that is created because of the walls on the shut off valve that actually slow down your water pressure. One thing you can do is actually move your water shut off valve back and forth to break loose all that sediment and corrosion that's on the inside of the pipes. Another thing you can kind of knock it a little bit to help vibrate that stuff loose. Something else you want to check is all of the main lines coming into your water heater. Make sure that there's no shut off valves there, that have been twisted a little bit or have...

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Occasionally, an electric water heater's circuit breaker trips for no apparent reason and resetting its toggle solves the problem.

Flip the circuit breaker's switch to the "Off" position and then back to the "On" position. This fully resets both legs of the circuit breaker. With the toggle set in the "On" position, a voltmeter should read about 240 volts across a two-pole circuit breaker's two terminals and 120 volts between a single-pole circuit breaker's terminal and ground. Let the system heat fully, then run a hot-water tap until the water heater turns on again.

Troubleshooting a circuit breaker that trips immediately:

This type of issue indicates a serious fault somewhere in the system. If the circuit breaker trips immediately, the circuit has an electrical short to ground.

Turn off the circuit breaker and keep it off throughout the repair process. Locate and correct the electrical fault before flipping the circuit breaker's toggle back to the "On" position....
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Today we are going to take a look at the most common water heater problems no hot water to your home. Most people do not think about maintaining their water heaters until they encounter a problem or leak. But all water heaters require ongoing maintenance to insure they last and work efficiently. When the water heater is not producing hot water, one of the first things to check is, if you have a gas or an electric unit? If you are not sure what type of water heater you have read this article for more details no hot water problems.

You will be working with gas or electric and extremely hot water Please be very careful!!

If you know what type of water heater you have, feel free to read some simple diagnostic information below. We have also some great videos on trouble shooting the most common problems all this can be found below.

How to find out if you have a Gas or Electric water heater

If you are unsure on the type of water heater you have there...

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A hot water heater is one of the most important appliances in your home but often taken for granted. Unless it’s been turned off for some reason, such as while you are on vacation, a water heater is used every single day. Like any other appliance, problems can come up. Fortunately, tank-type water heaters are fairly simple products. While all their components are important, there are relatively few of them when compared to other appliances. Most fixes can be made on your own without spending a fortune. Though if it’s a problem with the water tank itself, water heater replacement is usually the only solution.

Below are some of the most common issues homeowners may experience in regards to water heaters and hot water. To make it easier for you, there are sections for both Electric and Gas water heaters. Troubleshooting a problem is essentially a process of elimination so work your way down the list until you find the issue that most resembles what you are...

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It sounds like two problems.
Problem 1) Clog inside faucet or clog inside pipes at faucet
Remove supply tubes leading to faucet and see if problem is inside pipes or inside faucet.
My bet is clog inside faucet.

If you have galvanized pipe that meets copper pipe, this can be trouble spot.

Article on clogged water pipes at Inspectapedia:

Article on clogged pipes:

Problem 2) Water heater leak ... you say tank valve is leaking? Is that cold-water shut-off valve? Or tank drain valve? Or TP valve?

If cold water shut-off is leaking, then replace shut off.

If tank drain valve is leaking, then check if plastic valve is cracked. If drain valve is cracked, then replace with a brass valve from Home Depot. If plastic valve breaks off, then use hammer and...

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Check electrical panel to be sure that circuit breaker is in the "On" position (not in tripped or off) or fuses (if used) are installed securely and not "blown". Reset circuit breaker to "On" or replace any blown fuse(s) and wait 30 - 60 minutes for the water to warm. If water has remained cool, continue troubleshooting steps below.


Shut off the power. Most water heaters are supplied by voltages that can cause shock, burns and even death should an energized conductor come in contact with the body. Shut off power in the electrical panel by removing fuses or by moving the handle of a switch or circuit breaker dedicated to the water heater to the Off position. Completely remove and "pocket" the fuses or otherwise secure or lock the panel and place a note on the cover to alert everyone that work is being performed on the water heater circuit. This will prevent the accidental energizing of the circuit while you are working on it.



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This WATER PRESSURE PROBLEM DIAGNOSIS TABLE series provides a table giving step by step checklist for diagnosing water pressure, water pump, and water well problems. We give diagnostic and repair procedures for both municipal water supply problems and well water supply problems.

We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.

Green links show where you are. © Copyright 2017, All Rights Reserved.

Keep in mind that if water is running elsewhere in the building (another shower, sink, dishwasher, clothes washer, garden hose, etc) then the water pressure you will observe at your location will usually be reduced.

Notes: Some of the well pump troubleshooting suggestions in this list can be found at the Betta-Flo Jet Pump Installation Manualfrom the National Pump Co.



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Post 13

How often do you replace a residential (single family home) water regulator? A plumber told us to replace the water regulator every six years. We have never replaced our regulator and it is 37 years old. Are we being misinformed?

Post 12

I live in a condo complex. Each building has two water heaters. Our complex is about 25 years old and in good condition. We have always had consistent water pressure and never had issues with water temperature or ever having hot water available at any time.

About a year ago, the HOA decided to replace the two water heaters with one for each building. Since then, I, along with several other neighbors, have experienced unexpected hot water surges. I am constantly being burned in the shower! My neighbors have had similar experiences. The neighbors complain of banging...

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Generating electricity using household water pressure

I ran across this thread and smiled as I perused it. (click)

It was started by a man who wanted to put a tiny turbine in the city water pipe coming into his house, to generate electricity.

A lot of people found the thread and posted comments, asked questions, offered ideas and (I'm amazed at how patient they were) experts carefully told them why their ideas were impractical. It's an interesting read, for me at least.

I liked the guy that takes electricity from the phone line...
Yes it's possible, I've done it too, using a full wave bridge rectifier and don't load the phone line to less than about 30 VAC or your phone won't ring (the phone company will think it's 'off-the-hook'. You can use my CAL circuits to draw power efficiently.
and from the city water pressure (using a piston).
But that is only economical if you don't pay for your water.

Here's an inventor that proposes a...

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Cold Water Accumulators (Buffer Tank) Improving Water Pressure and Flow Rate in the property

Cold water accumulators are designed to increase flow rate and stabilize your pressures, although the effect of having the accumulator on the system for most people seems like as if the pressure has been increased. There is a standing pressure, which is the pressure when no outlets are being used and a working pressure the pressure when outlets are running. When the accumulator is linked into the system the increased flow rate helps to maintain the pressure close to the original standing pressure but with a better flow rate, for as long as water is stored in the accumulator. This is why you may need bigger cold water accumulators than you would have hot water tank.

A cold water accumulator is used to combat the problem of low water pressure in your water system. It uses an adjustable, pressurized compartment filled with air to compress the water coming in from the mains...

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Hey mopar1000,

Welcome to the community.

Low hot water pressure it is usually a result of the excessive amount of sediments that accumulate inside of the hot water tank or restrictions on either cold or hot water supply. Flushing out your hot water heater periodically helps and prolongs life of the water heater. This is a messy but not particularly difficult procedure.

First if this is a gas water heater set the thermostat on the “Pilot” setting, shut off the gas and cold water supply to the water heater. If this is electric water heater turn off circuit breakers designated to the unit.

Reconnect your garden hose to the unit and slowly open up a pressure relief valve, sometimes sediments are so dense inside the tank that they actually clog the drain so you may need to use a small screwdriver to (carefully) break sediments apart.

Repeat this process few times and stop once drain water is clear and free of sediments.

If draining shows no...

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