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4

It's a new problem. First, do anything you want. It's your health and there's no legal mandate, yet. The legionella issue is actually quite new. The disease itself wasn't even identifed until 1976 at the US Bicentennial in Philadelphia, when a bunch of people at a hotel got sick and died. Only this mass-casualty event made anyone notice and start to ...


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To answer the main question, an electric boiler is exactly as efficient at turning electricity into heat as individual electric heaters. However, individual electric heaters allow per-room heating setups; if you only rarely use a room, you can turn the heat down. However, an oil boiler will almost always be cheaper to run than either, unless you live near a ...


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I agree with the other answer about the mixing valve/lack of check valve being the most probable reason. However, I just had a first last night (which still has me searching online today, thus landing me here at this page) I got a call for the same reason. 27 story building. The apartments are split into 2 zones for the plumbing and those zones have ...


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I assume that this heating system is hot water and not steam since you said that you bled the rads. That said, when the boiler is working and most of the rads are hot, try bleeding the ones that are cold. If water comes out of the bleed valve then there is enough pressure in the system. If not raise the pressure. At that point, the problem is probably water ...


2

This seems like poor design of the thermostat: most household HVAC "24 VAC" transformers are designed to provide that voltage under load, i.e., while drawing the design current, perhaps one ampere. Open circuit (O.C.) voltage of 29 VAC is normal. That said, it would be easy to reduce the voltage to 24 VAC. Two 6 VDC zener diodes such as the 1N5340BG (~US$0....


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1) Is there any purpose for this valve other than for removing the pressure gauge? NO, the valve is only there for isolation of the gauge. Gauges like that have a high failure rate (for various reasons) and often need to be replaced "on the run"; that is, while the boiler is still in operation. 2) Is this a huge/expensive/messy accident waiting to ...


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SharkBite fittings are certified to 200 PSI and 200°F (93°C). Lots more info available on the official shark bite website. Here is a link to FAQ on the site where I found this answer.


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This is a long and complicated topic. I've noticed since being on this site that codes in the United States are very relaxed compared to the Canadian requirements. That being said, codes are a minimum requirement. Legionnaires affects the vulnerable. Like old people or sick people. Healthy people are not as susceptible to bacterial infections. I've seen your ...


2

TCO I am big on Total Cost of Ownership. In this case, it includes the cost of the equipment and also the ongoing cost of fuel. In many areas, electricity costs quite a bit more than fossil fuels (oil or gas) for heating - both space heating and water heating (and combined like a boiler). Essentially, you have to figure out how much heat you get from 1000€ ...


1

Adjust the regulator/vents on the first and second floors to a lower setting so the thermostat stays on longer so more heat gets to the third floor. Also, check the third floor vents to make sure they're open all the way and regulators are open all the way.


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I wanted to share the additional steps I took to troubleshoot the issue and describe what was ultimately causing the issue. The problem comes down to a weak and short spark. I was able to test the spark and witness that it was very quick and dim. I replaced the transformer and the protector relay. I likely did not have to replace the protector relay but ...


1

Can a expansion tank be used to protect a hot water heater? YES. Dose it need to be thermally listed? Not really if on the cold water feed and a check valve in the input of the pressure tank. The thermal cycling water really won’t heat the expansion tank, as the water is not being used when the water heater continues to heat some hot water pushes back into ...


1

Knowing nothing about your particular boiler, if you are adding water to the loop and water flows out the exhaust pipe, it sounds like your heat exchanger is leaking, as that's where a connection between the loop water and exhaust would be. Whether that's a simple part replacement or "new boiler time" will depend on the design of the boiler and price of ...


1

If a cover would suffice, the term for what to look for is a "stove pipe escutcheon" plate or flange. If you want to block air flow as well, use something non-flammable like rock wool (the newer versions that don't have asbestos). Do NOT use expanding foam...


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There are several spray foams in the marketplace designed specifically for this situation. I have used Great Stuff Fireblock and Pur Fill Fireblock in many commercial applications and have passed all Fire Marshal inspections. They should work well in a residential application as well. Both of these products are rated at a 240 degree flashpoint and can also ...


1

I often get a 28-29 volt no load reading and have never had any issues like you're describing. They are actually designed to be 24v at 50% rated capacity so no load they should read like 24.8 or 25.1 Yes 29v is a little high it's probably a cheap transformer or a little breakdown of insulation in the secondary. Possibly high primary voltage could be adding a ...


1

A thermopile produces more electric current than a thermocouple and have different electrical connections.. If the connector on the thermopile is the same as the old thermocouple, probably would work. Search Amazon for the part. I have gotten hard to find / discontinued parts from there.


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Seems your TRV was allowing a small flow to maintain the temperature of the (disconnected) radiator. Try capping the open end of the pipe, the male end in your illustration. Your local hardware store will have the right sized cap; take a cell-phone photo of the threaded open end with a ruler placed next to it, at the maximum width of the threads. To be ...


1

The small water tank (header per Owain) looks like it has no water in it. If that is the case, then it's likely your central heating system will have air in it, and so not work effectively. Try wiggling the ball valve to see if you can get some water in the tank.


1

Clean out the open end of the pilot light to make sure there is no debris interfering with the flow. I have some ventless gas logs that if I leave off completely off for a season or two will get clogged and with spiderwebs and sand from the old masonry. Cleaning the pilot by blowing and brushing from the open side without any disassembly has fixed it for me....


1

the aquastat is a brand name of water fired boiler controls. As such it controls a [water] boiler... as opposed to a furnace which only heats air. the control relies on a well or aquastat well which is a brass/copper thingamajig that is part of the temperature sensor which protrudes into the boiler to measure water temperature. These get corroded and ...


1

Air is a thing. (This took humanity millenia to figure this out; we figured out industrial use of fire soon after, and then, aviation!) You can even put air in a bag, that's what a bag of air is! Fire involves fuel (you bring) and air (that is just around). Your furnace and water heater burn a fuel, and get air from somewhere. Where they get it is very ...


1

Radiators don't put out a lot of heat at that temperature, so you'd need a lot more area, so the heating loop usually runs warmer than you'd really want the hot water cylinder to get up to, so the boiler thermostat setting is a bit of a compromise with a system with no diverter. Combi boilers that are either heat or HW but not both, often do have different ...


1

More information is needed about the system to accurately answer the question. It depends on what the two manufacturers recommend. Some boiler companies specify return pump. So the boiler circulator pumping into the boiler, others specify a supply pump. The first thing to consider is how the boiler manufacturer wants the system configured. Most of the ...


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You will need to find out if the pressure in the boiler is actually 35psi or is the gauge out of calibration. That gauge is called a "tridicator" that measures the boiler's water temperature and pressures. That gauge may need to be replaced. If you haven't had the unit serviced in 10 years it is time to call someone to have that unit serviced. According to ...


1

Yes you can, on your boiler there is a transformer above the gas valve. One terminal is the 24 v supply and the other is the common. It's not always easy to identify which is which. The process involves connecting one side of the secondary to the L2 (neutral) and checking if voltage is additive or subtractive. Hopefully it's identified. It's much easier that ...


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Here is a great Boiler Troubleshooting Tool that walks you through several issues, depending on your boiler model. Also, a link to a video regarding cold radiators.


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My guess is that pin shot out of the pressure relief valve. If you look at the parts in your repair ticket it should be listed.


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You shouldn't have any issue. I think you can 'cord-wire' your boiler replacing existing switch with a fixed outlet and putting a plug on boiler cord. So if needed youcan just unplug your boiler from the mains and run it from UPS. A third, to me better, option is to hardwire the UPS before the boiler so in case of outage it automatically kiks in keeping ...


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It all depends on what type of system you are running. The lowest temperature possible sufficient to satisfy the heating load is recommended due to the fuel savings. To give you an idea From a NHB service manual I personally wouldn't set anything contactable to more then 150ish°F.


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