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Boiler not flaring up, control says water is on but no heating

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Thermostat is not switching on boiler.


There are many ways for a hot water boiler to be controlled. One of them is to have an 'on-board' aqua-stat that cycles the boiler burners to maintain water temp set-point and the space thermostat controls only the circulating pump. There is no way of knowing if yours is set up this way, but try turning the thermostat on and off and see if the circulating pump cycles with it.

Volumns can be written on boiler control but with the limited information provided we can only guess.

Aug 25, 2015 | Heating & Cooling

Tip

Gas Boiler Condensing Best Features


Condensing boilers are the most efficient way to heat that there is today. The BTU’s that they wring out of the fuel put into them is the best of anything available today. Not only do they burn their fuel very well, they also have technologies built into them to help give then the highest efficiency possible on any given day.

Condensing gas boilers have been on the market for about twenty years now. The early boilers were noisy and very heavy. Today’s condensing boilers are not even remotely the same as their predecessors. There have been many improvements that make these boilers lighter, safer, and more reliable than ever.

Many of today’s condensing gas boilers are controlled by a computerized control that gives many options and features to customize your boiler to the type of system that it is being installed in. Not only does the control monitor the boiler, but it can be setup to control the whole heating system as well. This gives the added benefit of fewer controls and the saving of space. Circulator pumps, mixing controls, and injection pumps can all be controlled by the boiler control.

These technologies are things like sensors to make sure that they are running at the highest combustion efficiency possible or they will shut down. Outdoor reset controls will vary the water temperatures to make sure that the water temperature is only being heated as hot as is needed to make your house warm at any given outdoor temperature.
Sensors also monitor the supply and return water temperatures constantly to shut down the boiler if the boiler senses any unsafe conditions.
These boilers are so good that even if you fire the boiler before filling it with water, the boiler will shut off before it is damaged.

When looking at the boilers on the market today take into consideration all of the benefits of that the newer high efficiency boiler have to offer. High efficiency is really great, but there is so much more to them. The ease of installation because of the light weight of new condensing technology, the versatility of the controls that are incorporated into these boilers, and the outdoor reset technology that will save you fuel and make you much more comfortable.

http://www.fixya.com/support/r3706297-gas_condensing_boiler_high_efficiency

http://www.fixya.com/support/r3583943-condensing_gas_boilers__the_best_radiant

http://www.fixya.com/support/r3597748-the_extra_benefit_of_a_modulating_boiler

on Dec 24, 2009 | Heating & Cooling

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Boiler Replacement -When to do it


Your boiler is on the blink. Now you have some big decisions to make. Do I get another opinion? How much will it cost to replace the boiler as opposed to fixing it? How much energy will be saved? Home heating with a hot water heating system is a very good way to heat. However, when the boiler does not work or leaks there are many things to think about. The troubleshooting ideas in this article will work for both steam and hot water boilers.

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If there is no water running out of the boiler and it is just a control issue it may be best to get another opinion. If there is water running then there is a stop leak liquid that can be placed into the boiler as a temporary fix. It should be viewed as temporary and not a permanent fix. Either a section of the boiler will have to be replaced or the boiler may need to be completely replaced.

If the boiler is fairly new and the warranty will pay for some of the cost then replacing a section may be the way to go. Bear in mind though, that the warranty rarely covers the labor cost. Labor will need to be paid by the homeowner. If the boiler is more than 20 years old then it is a no-brainer, replace it, the increased efficiency combined with the age of the existing boiler make it a simple decision. Oil boilers especially are very much on a down hill slope by 20 years, gas boilers are often in better shape even though the efficiency is way down from what today's are. So bottom line, replace if older than 20 years. For boilers in the 10-15 year range it is often a very difficult call. Work with your heating service expert to figure the best option and I would definitely get a second or even a third opinion.

The next cause of trouble could be a failure of the controls on the boiler. Once again I would go with the 20 year rule. Unless the control that failed is relatively inexpensive I would replace the boiler. Often I have seen that when one control fails other controls are soon to follow and the beast becomes a money pit. This is especially true of oil burners. Many new boilers now come with a five year full replacement warranty that even cover labor. Once again the really hard questions come for those boilers in that five to fifteen year old age bracket. The questions get even harder when you are without heat, it is freezing outside and you do not have the time to get other opinions. At this point you have very limited options. Do make sure that you get a cost for the repair before you give the permission to fix the boiler. Electrical controls are not returnable once they have been installed. So once installed you bought them.

Questions about boiler failure and replacement are many. This should give a brief overview of the options that are available for the homeowner. There are many variables and often no answer is the completely right one. Many things depend on the situation of the homeowner, the age of the boiler, the cost of the repair, and the efficiency of the existing boiler as opposed to the efficiency of a new boiler. Many times that all adds up to a judgment call between the homeowner and the heating company.

on Dec 06, 2009 | Heating & Cooling

2 Answers

Boiler ok for hot water but no heating


What boiler do you have and is the controller a radio controlled thermostsat

Dec 14, 2014 | Water Water Heaters

1 Answer

Does the boiler thermostat control the heat of the radiators as well as the hot water temperature? Does the thermostat control the water temperature and the pump - as our pump seems to be on all the...


There should be a control called an aquastat that regulates the temperature of the boiler. The thermostat will turn on the circulator to start the flow of water through the radiators. If the water coming back from the radiators is very cold, a control will shut off the circulator until the boiler can come up to a predetermined temperature then start the flow of water again. If you have a tankless coil for domestic hot water, you now have a triple aquastat that maintains the temperature for domestic as well as the boiler temp. So yes the boiler thermostat (aquastat) does control the heat of the radiators and domestic hot water. No the pump is regulated by your house thermostat. You should take an amp draw on the boiler and componants to find out what is drawing more electricity than it should and popping your fuse.

Feb 19, 2011 | Heating & Cooling

1 Answer

I have a Y plan heating/domestic instalation.The boiler will go off and on even if the programmer is off,If the programmer is off and I turn the cylinder stat up the c/heating pump will run,i recently...


Hi the cylinderstat controls the hot water only not the heating the boiler stat controls the water temp the room theromstat controls the rads , if you have one ,

so boiler stat set on 180f or number 5 cylindersat set on 140f to 120f roomstat to your comfort , the boiler stat works as a over heat so if the cylinder stat or roomsat fail it will turn off on the boiler you should beable to check wiring from that .

Mar 10, 2010 | Heating & Cooling

1 Answer

I have a Baxi WM old boiler. Hot water only needed


there should be a switch which toggles between hot water only /// hot water + central heating /// & possible off on
Either on the boiler or on a separate timer control

Oct 19, 2009 | RTO Ariston Gl4.0 Instantaneous Electronic...

1 Answer

COMBI BOILER /CENTRAL HEATING


the boiler should modulate to controll the radiator temperature but the central heating will go off whilst you are drawing hot water

Nov 13, 2008 | Water Heaters

1 Answer

Have an oil fired boiler for baseboard heat and it also has a tankless heater for domestic hot water. No heat being called for only getting hot water for use. Boiler goes to 210 degrees before it knocks...


These boilers usually have multiple controls. The control that would take it out of the circuit at 210 degrees is a safety.

You should definitely have a professional take a look at this unit before you continue using it.

Sep 18, 2008 | Heating & Cooling

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