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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 off. It seem to push hot water through baseboard eventhough not calling for it. The controls are set to high limit 160 degrees

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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.

Posted on Sep 18, 2008

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We have a W. McLain CG, small house, just 1 zone so no zone valve. How do I get the pressure back up, it is too low and heat is not reaching the back room


Boilers are set at 180 degrees which gives between 550 and 600 degrees per foot of baseboard depending on the brand. You can change the aquastat setting to 200 degrees which will give more heat, but that may not be your problem. Your system may not be balanced properly. If there is too much baseboard(BB) near the thermostat, it may shut down the boiler before it is warm in the back room. You can close the dampers near where the stat is, and fully open the dampers in the cold room. There is also the possibility that you need to purge some air from the system.
The best solution would be to split off with another zone if none of this works. I'm assuming you have a CG-3, but what size is your house? Is there an indirect fired water heater that uses the boiler to heat domestic water? If you have a cg-3 and your house is over 1000 sq feet, then your boiler is undersized. Good luck!

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Want to shut off my hotwater heater and still run my boilerhave base board heat


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Jan 17, 2016 | Water Heaters

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My boiler dosent come on i have no hot water but when i turn the heating on boiler works but still no hot water what should i do


Hot water is gravity fed through your pipes. When you turn the faucet on the water will flow through the pipes. If your hot water heater is natural gas driven relight the pilot. Same if oil fueled. If electrical, check fuse to see if it has blown or the circuit breaker has tripped. If either has tripped, replace it and if it blows again the heater has a serious failure, you might need to buy a new one. If pilot won't light on gas unit, try relighting after 5 minutes, could be a bad thermocouple.

Apr 03, 2015 | Water Water Heaters

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I have a Heatslave 12/14 oil-fired combi boiler installed approx 8 years ago. A problem has just developed on the domestic hot water side. My local heating engineer has investigated but so far hasn't...


Symptoms sound like crossover might be part of problem:
Crossover is when cold water enters hot water line due to faulty plumbing part like check valve, mixing valve, or bad faucet cartridge.
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Jun 12, 2011 | Bosch 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

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My boiler heating is working but hot water is not coming. i want to know how to set hot water 24 hours 7 days


As I understand your question, you have a boiler with a 'summer/winter' hookup for domestic hot water.

Your boiler should run all the time, i.e. not be shut off by you. Your boiler provides hot water for baseboard heat in your home ... possibly through several 'zones' each controlled by an individual thermostat and circulator. Yours may be a steam system. If this is the case, you have radiators not radiant baseboard heaters and no circulators.

Your summer/winter hookup provides a constant supply of domestic hot water. It does this by taking cold water from your water main and passing it through a copper coil which sits inside your boiler and then to your hot water main in your home. Since the coil sits in the hot water at the top of the boiler, it is constantly being heated. This coil may be in a deteriorated condition in your case or it may be too small for your needs.

Several years ago, I did a small upgrade to my mid 1950's era American Standard boiler. The summer winter hookup in my case was mounted on a 4 inch cast iron boiler plug. The coil was 12 feet long (folded up to a package about 1 foot long). I was very afraid when the plumber came in with what amounted to a 10 foot long pipe wrench. My fear was I would have a pile of broken cast iron at the end of the day. All is well that ends well. He got the old one out and replaced it with a coil that consisted of 20 feet of copper tubing 3/4 inch in size (the folded tubing was about 20 inches long and fit nicely into the boiler). We now have all the hot water a household consisting of one guy and three gals would need in all but the extremest of times..

I think you r answer is here ... replace your summer/winter coil with a new, bigger coil.

Something else I did. My kitchen is 60 feet (pipe wise) from the boiler. It takes a long time to get hot water there. I put in a small electric hot water heater just under the kitchen. I put a timer on it so it runs for a couple hours in the morning and a few hours in the afternoon. The hot water line from the boiler serves as the cold water input to the heater. I now enjoy the convenience of quick hot water in the kitchen with the relatively low cost of oil heated water from the boiler as a relatively small cost of electricity.

My winter settings are 160 - 200 and my summer settings are 120 - 150 which seems adequate for our needs.

Thanks for your question at FixYa.com. I hope I have been of assistance to you today.

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1 Answer

Hot water not going, wanting to know how to turn it back on?


You have a real good description of your thermostat--
I wonder why you suspect the thermostat to be causing your 'No Hot Water' problem?

First of all, I have to be sure I understand your real problem--
When you say you want to 'turn the Hot Water back on', (It is 'Not going')
Do you mean you want a boiler (maybe in the basement?) -- or maybe a zone valve in a Hot Water, Baseboard heating system-- to be heating your house/ room/ apartment?

I would suppose, if you have the thermostat set higher than the room temperature, that it should be giving a 'call' to the boiler (or Baseboard Hot Water Heater..) to ignite a fire, and heat the waer, and then heat your room, or house.

So-- Could the problem be in the Device heating the Hot Water?

Please tell us more about your heating system-- what type of fuel, -- What happens when you lower the Thermostat, and then raise it-- What used to happen, and what does NOT now happen, etc.

Tell us more clues-- maybe we can help remotely like this-

Mack B

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thats because the rinnai does not have a set up for a circulating pump it would make the unit run all the time,, they are not designed to work that way,, you will have to just wait for the hot water to get to the faucet just like before,,don't let any one tell you there is a way once the water flows it turn on the tankless so it would never shut off, you could get on that goes on a timer on say the farthest fauset away from the unit and set the timer to come on like 2 min before you are ready to use the water in that bathroom in the morning or at night other then that there is nothing else you can do

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