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50 votes

Why are so many radiators installed beneath a window (at least in Germany)?

In addition to the three good reasons from Ratchet Freak and Isherwood, I add that placing the radiator near the window is most efficient. It heats the coldest air in the room and allows the air ...
jay613's user avatar
  • 39.4k
38 votes

Why are so many radiators installed beneath a window (at least in Germany)?

Because other wall space tends to get filled with closets, art and random stuff. Below a window tends to remain free real estate. Windows tend to stay closed during heating season so a window left isn'...
ratchet freak's user avatar
21 votes

Why does bleeding radiators save energy?

For maximum efficiency, many modern heating systems (condensing gas boilers, heat pumps) are designed to output heat at a low water flow temperature. The unit can generate heat more efficiently at (...
user1908704's user avatar
  • 1,401
19 votes

Why are so many radiators installed beneath a window (at least in Germany)?

In addition to what's been said, in extreme climates like Germany* and Minnesota, the window would completely frost over in January. Even modern low-e windows can't overcome -40°F, especially when ...
isherwood's user avatar
  • 139k
16 votes

Why are so many radiators installed beneath a window (at least in Germany)?

Windows are almost always going to be less efficient than wall assemblies (even triple pane windows will be less efficient than wall assemblies built with energy efficiency in mind — triple glazed has ...
statueuphemism's user avatar
16 votes

Why does bleeding radiators save energy?

If you get less heat because of air in the radiators, the losses in the system can add up to a greater %. Depending on where the pipes run, some heat might be lost in useless places. This is worse if ...
Olivier's user avatar
  • 1,220
13 votes

Why are so many radiators installed beneath a window (at least in Germany)?

There are a couple of (german-language) websites easily found that explain why this is the best and most efficient place to put your radiator, e.g. https://heizoel.totalenergies.de/rund-um-heizoel/...
Tom's user avatar
  • 426
9 votes

Why are so many radiators installed beneath a window (at least in Germany)?

This pattern is decades (or maybe a honest century) old and not limited to Germany. When the central heating started to emerge, energy prices were much, much less of a concern and the modern energy-...
fraxinus's user avatar
  • 3,149
7 votes
Accepted

My eq-3 Bluetooth Radiator Thermostat CC-RT-BLE is just showing "UPD". How can I "unbrick" it?

The official statement is that if you have no calor BT app that is currently paired, you are lost and should return the device to the dealer as broken. However, there is a way out - the following ...
Tilman Vogel's user avatar
7 votes
Accepted

PEX pipe burst: what else needs to be fixed to prevent it happening again?

PEX pipe does not corrode or otherwise interact with copper or other materials the way dissimilar metals do. It's essentially an inert substance under normal circumstances. The bulges and darkened ...
jwh20's user avatar
  • 23.4k
7 votes

Why does bleeding radiators save energy?

A radiator works best if the water inside it slows down and lingers to emit the heat into the room. Flow speed depends on the cross section of the pipe and the volume per time being pushed through, a ...
ratchet freak's user avatar
6 votes
Accepted

Newly purchased home, basement radiators don't work

The pipe gets cold because heated water is not circulating. That item is an air vent to release trapped air. This is not steam. The thing on the radiator is also an air vent. There's no valve because ...
Ecnerwal's user avatar
  • 218k
6 votes

Electric Boiler VS Electric Radiators hard wired

(I've assumed you're in the UK, as you've priced in pounds) Given the price difference in the UK between mains Gas (currently about £0.10/kWh for domestic use) and Electricity (currently about £0.33/...
MNB's user avatar
  • 161
5 votes
Accepted

Rust on Bathroom Radiator (Towel Rail)

Yes, there is but I doubt you will like the answer: Strip the existing paint off of this thing. Remove all the rust down to clean metal. Refinish this properly so that it doesn't rust again. ...
jwh20's user avatar
  • 23.4k
5 votes

Why are so many radiators installed beneath a window (at least in Germany)?

If you open the Window, well.. all the heat immediately flows away by convection. You are expected to air the room once or twice a day by opening the window wide for up to 20 minutes. At which time ...
DevSolar's user avatar
  • 151
5 votes

Why does bleeding radiators save energy?

Net energy consumption won't be affected very much if some radiators have some air in them. But if you look at the efficiency of the system's ability to heat the house, and to heat each room ...
jay613's user avatar
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4 votes
Accepted

Is there a reason I shouldn't use an oil radiator to heat a 1400 sq ft (130 sq m) space? (Why do commercial buildings use electric air heaters?)

Well, first off, you're wrong about the heat source. See the gray insulated pipes? Those are carrying hot fluid from (and cooler fluid back to) a source that costs a LOT less than electric resistance ...
Ecnerwal's user avatar
  • 218k
4 votes

Why are so many radiators installed beneath a window (at least in Germany)?

It leads to a more uniform temperature across the room, which helps saving energy. Having lived in an old, poorly insulated house with a gas oven at the central wall, I can confirm that you get an ...
a_leo's user avatar
  • 41
4 votes

Why are so many radiators installed beneath a window (at least in Germany)?

I studied the flow fields induced by convective heating in this exact situation for a university project. In fact it was a situation just like Tom's picture. Indeed I think that heating the air near ...
Not a chance's user avatar
4 votes

Why does bleeding radiators save energy?

You've hit on some major reasons why you should bleed them so I won't repeat them. Another reason is to balance the heat in all the rooms. If the thermostat is in a room with an un bled radiator, it ...
JACK's user avatar
  • 81.7k
4 votes

Connection between Copper and Pex pipe broke in extreme cold

Your "before" picture is too blurry to be useful, so try to remember: Did the end of the copper look like picture 1 below or picture 2? Picture 1 follows. This is a pex crimp coupling. ...
MTA's user avatar
  • 11.4k
4 votes

How would you babyproof a steam radiator that's recessed into the wall?

I would consider a common fireplace screen, which I'd attach to the wall in the drywall area (fairly easily repaired). You may need a spacer to account for the depth of the baseboard. Your local or ...
isherwood's user avatar
  • 139k
3 votes

Is there a tool that can clean the fins of a base board heater?

What worked for me were Q-tips. I worked them around the surfaces of each fin and attempted to do the same with the pipe to which the fins are attached. The shaft of the Q-tips were long enough to ...
BruceWilson's user avatar
3 votes

How can I stop my radiators "clicking" when they're turned on or off?

As the radiators heat and cool, they expand and contract. During this process they rub on the brackets that they are hung on. There should be small nylon horseshoe shaped inserts fitted into the ...
Paul Wallis's user avatar
3 votes

How do I turn off this two-pipe steam radiator?

The item on the left is the steam trap and can not be regulated or shut off. stay away from this item. The shut-off valve is the item with the screw on the top. Turn the nut ccw (counter clockwise), ...
d.george's user avatar
  • 12.4k
3 votes
Accepted

Part identification: Thermal cutoff within baseboard heater

Possible manufacturer could be: https://www.emerson.com/en-us/catalog/therm-o-disc-10h Product bulletin describes how the thermostat works: The 10H capillary tube is vacuum-charged with selected ...
kaigoneeme's user avatar
3 votes

Element wattage for electric radiators

These are dual-fuel radiators. Meaning they actually can use heat from two different sources, which is why the numbers aren't adding up the way you expect. In their standard mode of operation, they ...
Nate S.'s user avatar
  • 6,382
3 votes
Accepted

Saving energy with wall-mounted boiler and radiators

If you turn off 3 of the 4 radiators, then 3 of your 4 rooms will start to get chilly. It will likely take far longer than you'd like for you to warm up the bedroom after it's spent all day getting ...
FreeMan's user avatar
  • 47.4k
3 votes

Are those pipes at risk of clogging or leaking?

Yeah that's... really odd. Instead of a P-trap you've got something closer to an S-trap there. The first thing to check on this would be slope. From the drain in the picture, you need about 1/4" (...
Machavity's user avatar
  • 24.9k
3 votes

Capping radiator pipes away from trunkline because of asbestos

Clearly remediating the asbestos and capping close to the trunk/manifold is the best option. However, leaving dead legs in a sealed, non-potable hydronic system may be OK as long as: You're willing ...
Shimon Rura's user avatar
  • 8,252

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