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9 votes
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What is this box attached to the back of the house?

Thanks to @crip659 for the tip that helped solve this. It is a Boiler Sensor - Tekmar Outdoor Temp Sensor - Tekmar 70. Combined with the Tekmar 256 Boiler Control. It can be used to adjust the ...
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  • 753
7 votes
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How does a boiler pump circulate water?

does the spin on that impeller (at a high velocity) really create enough momentum to move water up seven or eight stories? It doesn't have to create momentum as it isn't throwing water ballistically. ...
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5 votes

Why is my furnace leaking, and what is it leaking?

I know it's in the comments, but I feel it's important enough to place in an answer: Never EVER throw water on a fire that is , or might be, oil or gasoline - based! If your furnace does not have an ...
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5 votes

Can I attach the hot hose from my washer to my boiler relief?

Sadly, the answer is "no". Hot water, both in the boiler and in the radiators, is very corrosive IF there is oxygen in it. Water from your well or town has dissolved air, including oxygen (it's why ...
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5 votes
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Is there a way to put Taco zone valves in a closed position?

TL;DR: is there a way to put the zone valves into a forced-closed position? Taco zone-valve (wax piston actator): disconnect top wire at contact marked #1 and wait 2 mins, or disconnect all wires,...
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5 votes

What kind of tubing should I use for draining condensate from a furnace / boiler?

TLDR: Plastic tubing seems the safest to use. You may be able to use certain types of metal in some cases, but acidity in the condensate can damage those materials. ICC model building code as an ...
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  • 4,934
5 votes

Is storing hot water over 140F a regional requirement?

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 ...
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5 votes
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is it okay if heat exchanger's secondary is connected reverse

You want to get that corrected. Plate heat exchangers like the one you have can be used in two arrangements: parallel flow (co-current): both inlets on one end, outlets on the other, which is what ...
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  • 1,665
5 votes

What do T, RF and Lost mean in a circuit diagram?

The left part of the circuit diagram tells you how to connect the device, the right part tells you its internals. You need only to understand the left part in order to install it; the right part can ...
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  • 51
4 votes

Where do I connect my C wire from my thermostat when there are two transformers?

Okay... After reviewing your new photos, I think I have it figured out. This is what your system looks like You'll have to excuse the glitter pens, it's the only thing I could find on my wife's ...
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  • 128k
4 votes
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Can I have a washer, electric dryer, oil tank, and oil burner all in the same room?

Unless you have a written local amendment disallowing it there is no reason this would be unsafe or prohibited. I have seen and worked on many, many basements that fit this exact description. My only ...
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4 votes

Pressure problems with oil boiler

Your diagnostics so far point to the indirect hot water heater coil leaking potable water into the furnace loop as the most likely issue. You could perhaps verify if you can shut your hot water down ...
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  • 133k
4 votes

What could cause my boiler to provide hot water, but not heating?

The room thermostat does not control the boiler directly. Instead, it controls a circulating pump that draws heat from the boiler and delivers it to the radiator(s) in the room. It is the removal of ...
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  • 1,295
4 votes

How to determine how many gallons of oil your oval tank holds?

Your tank is in fact not oval, but stadium in profile. (Yes, that's where the sports facilities got their name.) In the case of a tank measuring 60" × 40" × 27", your volume is (nominally)...
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  • 104k
4 votes

any sort of inflatable cork to plug pipe when shutoff valve is being repaired

If you can stop the flow of water in the system you can freeze the water in the pipe, then fix whatever you have to. This works on steel and copper pipe. I have frozen pipes up to 2 inches. A pipe ...
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  • 12.1k
4 votes

Mini-split vs gas boiler for heating

The thing is: heat pumps move heat around rather than creating it, so they are more than 100% efficient. They collect heat from the outside air and move it inside, and depending on the available heat ...
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  • 157
3 votes
Accepted

Home heating fuel comparison (wood and heat pumps)

You're right, but only because oil is the worst, most expensive way to heat a home. Pretty much anything beats it, except maybe electric resistance in places with high electricity prices. Wood, gas, ...
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  • 12.2k
3 votes

Are uninsulated steam pipes behind walls and touching beams a fire hazard?

Do you know the temperature of steam pipes? Do you know the ignition point of wood? Some say the "ignition" point of wood is 451 deg F. Most say around 570 deg F. Either way, the surface temperature ...
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3 votes
Accepted

Would upgrading hot water radiator heating result in much better efficiency?

Why is knob and tube top priority to replace? It's quite safe if left alone. You only need to replace it in visible areas: the stuff behind the wall doesn't need replacing. You might want to add some ...
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  • 1,781
3 votes

How to repressurise a Baxi Duo Tec Combi 24 HE boiler

Looks the same as mine, and since I've ended up here with the same question, I thought I'd update with an answer. Looking at the third photo it looks as though you have the filling loop permanently ...
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  • 31
3 votes

Why does my boiler vent steam?

Assuming that your boiler and mine are similar, you have two vents or pipes and the main exhaust. Main exhaust will emit carbon dioxide and water vapour, the products of combustion. A modern boiler ...
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  • 91
3 votes
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How to determine how many gallons of oil your oval tank holds?

The most common size is 275 gallons, which measures 44” x 60” x 27”
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3 votes

Gym Equipment in the Oil Tank Room?

You should seek the advice from a recognized medical practitioner. You wouldn't place your health and well-being on the answers of people who drink beer and chew tobacco all day would you? If I had to ...
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  • 10.8k
3 votes

Is it dangerous to not replace a steam boiler pressure gauge that is stuck at 0?

Dangerous? If it malfunctions and an over-pressure event occurs, that's dangerous. Whether or not a functioning gauge will provide early warning or not would depend on the experience/knowledge level ...
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  • 33.4k
3 votes
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UK Vented Heating Problem - F25 Error on Glow Worm Boiler

Looks like quite a few people still come across this question so I thought I would post what the problem was in the hope it may help others. After trying everything it could possibly be, including ...
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3 votes
Accepted

Why is my furnace leaking, and what is it leaking?

From reading all that you wrote, including the update, it is clear that there is an oil leak somewhere in the furnace mechanism or in the fuel line leading up to the furnace. You should continue to ...
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  • 61.2k
3 votes
Accepted

Should I perform annual maintenance on our heating boiler?

The oil boilers I'm familiar with should be inspected and tuned annually. Many newer gas boilers need preventative maintenance only once every two years. I suspect pellet boilers want attention ...
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  • 16k
3 votes

What is the name and function of this thingy seen attached to many boiler pipes?

It might be some sort of woo/voodoo device sold to separate the gullible from their hard earned cash. Possible example I've no idea if this sort of device has any basis in real science but I am ...
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3 votes
Accepted

Is this my stopcock / stop valve?

The Polypipe parts with red and blue taps look like heating manifolds (do you have underfloor heating?) and are not likely to be the stop tap. You'll have to follow the two pipes to the right in the ...
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  • 2,360
3 votes

Y Plan Sundial - 150V on orange wire, boiler stays on in heating only mode

According to V4073A FAQ: When this Heating demand is satisfied, during a Heating ON period, 50V to 150V (voltage can vary according to the supply) will remain on the orange wire... So the ...
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