How long does it take for radiators to get fully Hot

_Jem_

District heating is terrible eon has messed up again. I'm just wondering how long it takes normally for all of the radiator to get Hot🔥 not just the top of the radiator. 

Gas/oil it doesn't matter what you are on.

Thanks

Astria

Surely that depends on how much pipework there is from the boiler to the radiator, whether any other radiators are on the same pipework as the one you are talking about, whether or not there's air in the radiators, and so on.

I've been in several buildings where the radiators are connected from the output of one to the input of the other, so the one at the end is the coldest for the longest amount of time and the first one is always the hottest.

Etch

From cold, my old 22kW gas boiler burns continuously for 13 mins to achieve the set flow temperature, by which time the radiators will be fully hot. It then stops burning and cycles to maintain the set flow temp.

[Deleted User]

I once worked on a large business estate. Come what may, the main central heating boilers were turned on in mid August to ensure that remote buildings actually got some heating before winter set in. Comparing a domestic boiler heating system to District Heating may not be a fair comparison.

_Jem_

Thanks, Yes comparing isn't going to be a good comparison but so I'm told it should be close to what a domestic does. Just interested in what other peoples systems are like. 👍

sandy700

My radiators are too hot to keep my hand on other than a quick touch within 15 minutes of the heating coming on in the morning.

I've just had my boiler serviced and the engineer recommends setting the flow temperature to 65 deg C in this cold weather.

Astria

sandy700 said:

My radiators are too hot to keep my hand on other than a quick touch within 15 minutes of the heating coming on in the morning.

I've just had my boiler serviced and the engineer recommends setting the flow temperature to 65 deg C in this cold weather.

That will typically be based on your system only. It should be set at whatever it takes to bring your house upto temperature without constantly cycling - so it depends on the amount of radiators you have an overall surface area.

Mine is set at 58 for that reason - if its lower then the boiler will cycle and the house will take a long time to heat up as a result, and if it's higher it becomes less efficient.

_Jem_

sandy700 said:

My radiators are too hot to keep my hand on other than a quick touch within 15 minutes of the heating coming on in the morning.

I've just had my boiler serviced and the engineer recommends setting the flow temperature to 65 deg C in this cold weather.

Is that the whole radiator or just the top? 

k_man

Astria said:

sandy700 said:

My radiators are too hot to keep my hand on other than a quick touch within 15 minutes of the heating coming on in the morning.

I've just had my boiler serviced and the engineer recommends setting the flow temperature to 65 deg C in this cold weather.

That will typically be based on your system only. It should be set at whatever it takes to bring your house upto temperature without constantly cycling - so it depends on the amount of radiators you have an overall surface area.

Mine is set at 58 for that reason - if its lower then the boiler will cycle and the house will take a long time to heat up as a result, and if it's higher it becomes less efficient.

Are you sure it's that way around?
Cycling on the boiler is usually when it is providing more heat than the heating system can use (so it stops heating and just pumps for a while), usually due to higher flow temperature.

[Deleted User]

Is that the whole radiator or just the top? 

Trying to equate domestic boilers with district heating is getting a bit tiresome as there is no direct comparison. The 65C being talked about is the temperature of the heated water exiting the gas boiler into the heating system. Some heat will be lost in the piping between the boiler and the first radiator. Most domestic systems are designed for a 20C return temperature differential. For a modern domestic gas boiler, any return temperature below 56C means that the boiler is able to extract heat from the boiler flue gases which increases overall boiler efficiency.

No doubt the supplier operating your District Heating system will have its boiler set up to run as efficiently as possible. With sufficiently sized radiators - and good insulation - you could have a very warm home with a flow temperature of 40C. 

_Jem_

[Deleted User] said:

Is that the whole radiator or just the top? 

Trying to equate domestic boilers with district heating is getting a bit tiresome as there is no direct comparison. The 65C being talked about is the temperature of the heated water exiting the gas boiler into the heating system. Some heat will be lost in the piping between the boiler and the first radiator. Most domestic systems are designed for a 20C return temperature differential. For a modern domestic gas boiler, any return temperature below 56C means that the boiler is able to extract heat from the boiler flue gases which increases overall boiler efficiency.

No doubt the supplier operating your District Heating system will have its boiler set up to run as efficiently as possible. With sufficiently sized radiators - and good insulation - you could have a very warm home with a flow temperature of 40C. 

😂😂😂😂😂 We haven't had any heating since Saturday. EON has completely messed up.

I was just finding out what people's heating is like as I'm more likely going to move out of a district heating town.