Best temp setting for hot water boilers aquastat

The Wall. Click here to Find a Contractor in your area. Here are the website rules, as well as some tips for using this forum.

If you've found help here, check back in to let us know how everything worked out. It's a great way to thank those who helped you. Need to contact us? I have a peerless oil fired boiler series WB with a domestic hot water coil that is giving me a little problem. I had the coil cleaned 2 days ago and last night I went from hot shower to warm in minutes.

November Try this: A common type of controller used in hydronic systems is the triple acting aquastat. Although the control can be purchased by itself, it is normally used as the heart of the hydronic system controller.

It allows for the control of the high limit, low limit and circulator functions by a single aquastat control. It consists of the triple acting aquastat and a built-in switching relay. The triple acting aquastat, a switching relay and a primary control make up the most elaborate of the system controllers for oil-fired systems. Let's take a look at how it works. First of all let's look at the easiest part, the high limit, and then the low limit-reverse.

The high limit is adjusted using the knob marked 'HI'. It is marked and adjustable from F to F, and has a fixed differential of 10 F.

So, if it is set at F, it will shut the burner off and interrupt power from the B1 terminal F and turn the power on again at F. The terminals marked Black and Yellow relate to this switch.

How Does the Aquastat on a Boiler Work?

The low-limit-reverse is adjusted using the knob marked 'LO'. It is marked and adjustable from F to F, and has an adjustable differential of between 10 F and 25 F. The differential is set using the knob marked 'DIFF'.Log in or Sign up. Recommended oil furnace temperature settings?

Joined: Mar 24, We have an oil furnace controlled by a Honeywell box with two temperature dials on it. One appears to the max and the other the minimum temperature for water in the coil of the boiler.

Is there are recommended setting for either of these for maximum efficiency it this heater is for forced hot water heat only? As we use an indirect water heater for service hot water that regulates temperature on its own. Thanks for any input! Joined: Sep 2, Occupation: Retired Systems engineer for defense industry. Location: New England.

Optimize Hot Water Temperature

Unless the boiler is smart enough to raise the supply temperature by zone, you probably want degrees going into the indirect to get reasonable recovery rate. Most radiators are desgined for that temperature, too. To keep the thing from short cycling it works best if it runs for awhileyou might want to try something like See what the pros have to say. The new, smarter controls will adjust the boiler temperature for the needs, and might only run say degrees on a mild day to keep them on longer rather than cycyling on and off at a higher temp.

You don't have that option. They combine this with a variable burner, but I don't think they've been able to do that for an oil burner, only gas. Adjusting boiler temperature for summer This same question has occured to me, as we have a similar oil boiler with probably the exact Honeywell temperature control unit bolted to it. My heating guy suggested that we set it degrees in winter and set the thrid dial to a spread of 15 degrees not sure exactly why, since the spread seems to be 20 degrees, but this 3rd dial possibly controls something else.

On very cold days below 15 degrees or soI boost these numbers tosince our house doesn't have quite as much running baseboad as it should. BUT, here's my question: since we have an indirect SuperStor hot water tank, which runs as a zone off the boiler, what's a good temperature to set the boiler during the warm months?

I've lowered it towhich still provides us with ample hot water Should I consider lowering the numbers even more ? My boiler control treats the indirect as a priority zone and automatically bumps the supply temp up to the highest it normally runs while supplying heat to the indirect. Once that is satisfied, it adjusts the supply temp to the other branches as required.

The baseboard heaters will provide more heat as your supply temp rises. Ideally, an outside reset system would compare the outside temps to the call for heat and adjust the boiler operating temp, but that is usually on newer boilers. One consideration is if the boiler is designed to handle cold starts. Some heat exchangers can't handle a burst of cold water into them. If yours can, and it has a priority zone override, then you could turn the summer boiler temps way down, essentially enough so it doesn't turn on except when the indirect calls for heat.

IF the boiler doesn't have a priority circuit to override the normal setting when the indirect comes on, you'll get a very slow recovery rate on the indirect if the input drops below the normal design temp.

Over time, at a lower setting, it will still heat the water, but depending on use, it would appear as a much smaller tank. If you never run out of hot water, it either treats it as a priority zone and overrides the settings, or you aren't using enough hot water at a time to dilute the tank and cool things off enough to notice. Thanks, Jim, for your comments. It's quite possible that we don't use enough hot water at any one time to deplete the supply. In any event, it is more economical to set the boiler a bit cooler in the summer, isn't it?

The technical support rep at the company that manufacturers the SuperStor suggested I keep the boiler at even in the summer, but that seems wasteful to me. Depending on the school of thought you adhere to, it's a good idea to set the WH thermostat to or so.Log in or Sign up.

Joined: Jun 6, Location: New York. Hey all Six months ago we moved into an old house with an oil fired boiler system. For reasons unknown, the previous owner had the DHW portion of the boiler disconnected, capped off and a propane water heater installed.

Since the DHW portion of the boiler is no longer in use, I wanted to make sure that the temperatures settings are correctly set since winter is rapidly approaching and we have already learned that the previous owner did many things ass-backwards. Does this sound like a standard setting to you for a two-zone, heating-only boiler in a year old drafty New York farmhouse? On another note Is this still true with the DHW disconnected? Last edited: Nov 8, BackglassNov 8, Joined: Sep 2, Occupation: Retired Systems engineer for defense industry.

Location: New England. I think that those settings would cause the boiler to cycle a lot and be inefficient. I don't have enough experience to tell you what it should be, but while that may have been reasonable if making DHW, I don't think it is best for space heating.

Some boilers cannot tolerate the return water being much colder than the source. I have no idea if yours is one of them. On the new, high efficiency ones, they'll cool off to ambient, and only turn on to prevent freezing if the system isn't calling for heat in some manner.

Older ones cannot handle that. Most radiator type systems are designed for degree water to provide their full output. Obviously, you don't need that all of the time. Your boiler probably isn't able to adjust the output dynamically, so if a lower temperature would work, it could run that longer and you'd be more comfortable.

A constant even heat rather than on again off again is more comfortable, if your system can provide it. Retrofitting that capability to an older system may not be easy or ecconomical. Hopefully, someone who has more practical experience will answer. So you are thinking it should more like ?

I am new to the boiler world. BackglassNov 10, Without knowing the deisgn of the boiler, I'm not sure If the boiler could stand it, you could let it cool way down when not calling for heat, then rise up to the design temperature, if it ever gets there, based on the needed heat.

But, some boilers can't handle that. Mine will. It will drop to room temperature, and only heats to where it needs to based on the outside temperature and how much of a drop it sees between the output temperature and the returning water.

On a cool day, degree water may be sufficient to keep the house warm, while it might need to be on a super cold night. I'd leave the darn thing alone until I had some measure of its performance. Maybe the radiators are oversized and degree water is fine. As Jim notes, cooling off may be bad for the boiler - it may develop leaks. Then again, maybe cooling off is fine.The boiler temperature control acts as a limit switch.

It is the central link for burner and circulator operation. The boiler temperature control has adjustable temperature sensing for limit control, which will be made to address different applications.

There are three common types of boiler temperature controls See Figure B that provide single acting, dual acting and triple acting functions. The high limit setting is the maximum temperature the boiler can attain. When the high limit set point is reached the burner turns off. When the high limit differential set point is reached the control closes, allowing the burner to turn back on if there is still a call for heat.

The low limit setting is the minimum temperature the boiler can attain. When the low limit set point is reached the burner turns on. When the low limit differential set point is reached. Additionally the Dual Acting Boiler Temperature Control will employ circulator terminals that energize a circulator to distribute heat transfer fluid to the heated zone.

The thermostat controls the circulator, turning it on and off as dictated by sensed temperatures in the heated space. The boiler temperature control opens to turn the circulator off if boiler water temperature drops below the low limit to maintain a minimum boiler temperature.

The Temperature in Your Boiler and the Dangers of Overheating

A Triple Acting Boiler Temperature Control incorporates a high and low limit with differential functions, along with a relay to energize the circulator. The high and low limit functions are identical to the description given for the Single Acting Boiler Temperature Control.

best temp setting for hot water boilers aquastat

The low limit maintains a minimum temperature while the high limit controls maximum temperature. The circulator circulates the heat transfer fluid to the heated zone. As with the Dual Acting Boiler Temperature Control, the circulator turns on and off by thermostat input. Assumption: No TT Call for heat. The Beckett AquaSmart is an advanced triple acting boiler temperature control designed for use on residential and light commercial boiler systems.The Wall. Click here to Find a Contractor in your area.

Here are the website rules, as well as some tips for using this forum. If you've found help here, check back in to let us know how everything worked out.

It's a great way to thank those who helped you. Need to contact us? JOhn Whalen Member Posts: 1. Hi, 1. Can anyone tell me the correct aquastat settings for aHoneywell Aquastat? This is for a hot water heating system Slant Fin for a 3 bedroom house. I assume that the 3rd control is that of hysteresis. Setting of 20? What is the typical accuracy of these settings? The temp guage just slightly above the Aquastat reads about 20 degrees different consistently, than the Aquastat settings itself.

Thanks John. November Depends on the aquastat. What is the model of the aquastat? What is the make and model and year of the boiler? Unknown Member. Gas or oil? The high is the temperature adjusted by the differential setpoint that the boiler runs at when the thermostat is calling for heat. The low is the temperature that the boiler runs at when the heat is not being called for. It is for domestic hot water production with the tankless coil.

Al Letellier Member Posts: The high limit depends on boiler size, domestic hot water load and design heating temp.

What Is The Best Water Heater Temperature Setting?

Whatever high temp you need to heat your house on the coldest day is where it should be set. Aquastat Settings One of the most common types of controller used in hydronic systems is the triple acting aquastat. Although the control can be purchased by itself, it is normally used as the heart of the hydronic system controller.

It allows for the control of the high limit, low limit and circulator functions by a single aquastat control. It consists of the triple acting aquastat and a built in switching relay. The triple acting aquastat, a switching relay and a primary control make up the most elaborate of the system controllers.

This is where all of the temperature control for the system, except for room comfort settings, is determined. It is marked and adjustable from F to F, and has a fixed differential of 10F.

So, if it was set at F, it would shut the burner off and interrupt power from the B1 terminal at F and turn the power on again at F. The terminals marked Black and Yellow relate to this switch. It is marked and adjustable from F to F, and has an adjustable differential of between 10F and 25F. Now here is where it gets a little complicated in the Honeywell control.Before we know it however, the autumn will be here and the nights will begin to draw in. When it comes to heating controls, many people just turn it on and hope for the best.

So, what is the ideal temperature for central heating? Studies have found that this is the most comfortable interior temperature range for the majority of people surveyed. For older or less mobile people, between 22 and 23 degrees is a better temperature.

Many people think that if they whack up the thermostat high, it will help the house to heat up more quickly. This method however, is inefficient and only uses more fuel with no benefit.

Because your boiler works at one speed, turning the thermostat up too high will only waste energy, costing you money and making your home way too hot. Using your boiler controls correctly can help you to save a considerable amount of money and create a more comfortable living area.

First and foremost, locate the two dials and the digital display on the front of your combi boiler. These control the output temperature for the radiators and the hot water temperature. To maximise efficiency, we recommend setting your radiator dial to 75 degrees and your hot water to 60 degrees. With a combi boiler, hot water is on demand.

When you open a hot water tap the boiler is triggered to supply hot water, so no need to set the timer for hot water. For your central heating system, your timer settings will depend on when you spend most time at home.

For most people, setting your central heating to come on half an hour before their alarm clock and half an hour before they come home from work is most convenient. An hour of heating in the morning and evening is a good starting point for your central heating system. If you need a boost of heat during a particularly cold snap, you can easily override your timings by manually turning on your heating system.

Most modern radiators are fitted with thermostatic radiator valves. They can be adjusted to regulate the flow of water into a room in order to control the temperature. Radiator valves usually have temperature settings from one to five. For maximum efficiency, set the radiators in your living room to three or four and in your bedrooms to two. It is never a good idea to turn off radiators in individual rooms. If a room of your home is not in regular use, turn the thermostatic valve down as low as possible to prevent problems with mould and damp from occurring.

For nearly five years, we have been helping homeowners across the UK with all their home heating requirements. The offer runs until the 31st August so act quickly to get your home winter ready.

best temp setting for hot water boilers aquastat

Call us on or contact us online. Your combi boilers ideal temperature for central heating. Your boiler controls explained Using your boiler controls correctly can help you to save a considerable amount of money and create a more comfortable living area. Different room, different temperature Most modern radiators are fitted with thermostatic radiator valves.

ProTech Boilers: Heating homes across the UK For nearly five years, we have been helping homeowners across the UK with all their home heating requirements. Get an instant quote now.InspectAPedia tolerates no conflicts of interest.

best temp setting for hot water boilers aquastat

We have no relationship with advertisers, products, or services discussed at this website. Here we explain how to choose the best settings for a heating boiler aquastat - the combination control that sets boiler temperature and may also control hot water production via a tankless coil on the heating boiler. After explaining the Hi, Lo, and Diff controls we review the newer universal replacement aquastat from Honeywell, the LU Universal Aquastat, followed by a discussion of the simpler single-limit control switches.

This article series answers most questions about Heating System Boiler Controls on central heating systems to aid in troubleshooting, inspection, diagnosis, and repairs. Contact us to suggest text changes and additions and, if you wish, to receive online listing and credit for that contribution. Lots of people, even some service technicians are confused about the actual function of combination controls and aquastats like the Honeywell RD.

These were "Safe" settings for this control, and it's in with similar settings on millions of heating boilers. Setting the HI: save money on heating costs by running the boiler at a higher temperature. The thermal conductivity of heating water inside of finned copper tubing baseboards or through radiator surfaces is exponentially greater at higher temperatures. In other words, hotter water actually transfers heat into the occupied space more efficiently than cooler water.

Since this is not lab-grade equipment these settings are not precisely accurate. We let the boiler run through a few heating cycles, watching the temperature and pressure gauges on the boiler to see what temperature we're actually reaching.

And we watch the boiler relief valve to be sure we're not causing leakage there. Watch out : Setting the "HI" too high on the aquastat can result in over-temperature in the heating boiler and can result in dumping water and temperature and pressure at the relief valve. If your TP valve was not leaking before and it begins to drip when you set up the HI to F, step the HI back to and try that setting. If your TP valve is leaking at or less it's likely that you need a heating service call - something's probably wrong with the relief valve, with system operating pressures, or with the controls.

In our photo at left you'll see where the heating service tech left this "LO" limit control after cleaning and tuning the heating boiler. The "LO" is set at least 20 deg F. If we set the "LO" any closer top "HI" it is possible that the control, trying to give priority to making domestic hot water for someone in the shower, will simply lock out the circulator pump entirely - the heating circulator will never run. That keeps the LO temperature operating range as high as possible in the boiler and that in turn gives us the most heat stored in the boiler for making hot water through the tankless coil.

The circulator will not run. Watch out : don't set the LO above or higher than the HI temperature limit. If you make that mistake, you will lock out the circulator pump and your heating system will not work properly.


Best temp setting for hot water boilers aquastat