Water Roasting & Rads Lukewarm

statto25 · 29-11-2017 11:20pm #1

Looking for some advice on adjusting the thermostats on our hot water tank and on our pump system. We have an insert stove which heats the hot water and the rads. At the moment the thermostat on the hot tank is set low around 30 degrees. The second thermostat which is linked to the pump system in the hot press is set to around 60 degrees. Our hot water is always roasting but the rads only get warm. We also have oil driven central heating which heats the rads and water together no problem. Have I got my temps wrong in the hot press or has anyone an idea as to why my rads are only warm when a fire has been down all day?

gillad · 30-11-2017 12:53pm

statto25 wrote: »

Looking for some advice on adjusting the thermostats on our hot water tank and on our pump system. We have an insert stove which heats the hot water and the rads. At the moment the thermostat on the hot tank is set low around 30 degrees. The second thermostat which is linked to the pump system in the hot press is set to around 60 degrees. Our hot water is always roasting but the rads only get warm. We also have oil driven central heating which heats the rads and water together no problem. Have I got my temps wrong in the hot press or has anyone an idea as to why my rads are only warm when a fire has been down all day?

bring the thermostat on the stove pump back to 50 degrees as the pump may not be running much if set too high....the gravity feed on the cylinder will always be circulating which is why you have roasting water.

statto25 · 13-12-2017 10:03am

gillad wrote: »

bring the thermostat on the stove pump back to 50 degrees as the pump may not be running much if set too high....the gravity feed on the cylinder will always be circulating which is why you have roasting water.

OK the thermostat on the pump is set to 50 and there has been a slight improvement in heat but nothing drastic.
If my pump is set to 50, what temp should my tank be set to? Also should the stat on the stove itself be set to low or high for heating the rads? Its driving me soft as I seem to spend my time going up and down the stairs to the hotpress to try and sort this and I'm getting nowhere. Any help is appreciated

monseiur · 13-12-2017 12:07pm

You need a high output boiler in stove to heat rads. sufficiently - perhaps this is the source of your problem ?
M.

gillad · 13-12-2017 12:40pm

statto25 wrote: »

OK the thermostat on the pump is set to 50 and there has been a slight improvement in heat but nothing drastic.
If my pump is set to 50, what temp should my tank be set to? Also should the stat on the stove itself be set to low or high for heating the rads? Its driving me soft as I seem to spend my time going up and down the stairs to the hotpress to try and sort this and I'm getting nowhere. Any help is appreciated

What type of stove is it?,as i dont understand "the stat on the stove"
what type of fuel do you burn?
if you turn off half of the rads ,will the rest get hot enough?

The temp of the rads is determined by the quality of fire and quality of stove,the stat just controls how long the pump runs for.

statto25 · 13-12-2017 12:51pm

gillad wrote: »

What type of stove is it?,as i dont understand "the stat on the stove"
what type of fuel do you burn?
if you turn off half of the rads ,will the rest get hot enough?

The temp of the rads is determined by the quality of fire and quality of stove,the stat just controls how long the pump runs for.

Its a Henley 17Kw inset w/BB. There is a regulator on the side of the stove which adjusts the heat. We would burn mostly coal. I haven't started to turn off rads yet but its the next thing to try.

gillad · 13-12-2017 1:03pm

statto25 wrote: »

I haven't started to turn off rads yet but its the next thing to try.

This should tell you how many rads the stove can heat properly

statto25 · 13-12-2017 1:10pm

gillad wrote: »

This should tell you how many rads the stove can heat properly

Cheers, I'll give that a rattle this evening.

Dtp1979 · 13-12-2017 7:59pm

How many radiators do you have?

statto25 · 13-12-2017 8:49pm

Dtp1979 wrote: »

How many radiators do you have?

6 double panel rads and 4 of the half size double panel.

Dtp1979 · 13-12-2017 9:30pm

statto25 wrote: »

6 double panel rads and 4 of the half size double panel.

Ok 17kw to water stove should heat them reasonably well. Assuming they’re not huge doubles. I’d really need to see the pipework all as one picture in your hot press. Do you have an oil boiler ?

statto25 · 13-12-2017 10:14pm

No the rads aren't huge at all. Yes we also have an oil boiler and it heats the rads to piping hot. To give you an idea of what's going on, I had the tank stat set to 60, the pump to 45 and after a couple of mins the pump stops and rads go cold very quickly. Move the temp of tank back to 50 and it pump kicks off again. Fire has its thermo stat set to 8 (fully open). I'll try and get a pic but the way the hot press is it might be difficult.

Dtp1979 · 13-12-2017 11:46pm

statto25 wrote: »

No the rads aren't huge at all. Yes we also have an oil boiler and it heats the rads to piping hot. To give you an idea of what's going on, I had the tank stat set to 60, the pump to 45 and after a couple of mins the pump stops and rads go cold very quickly. Move the temp of tank back to 50 and it pump kicks off again. Fire has its thermo stat set to 8 (fully open). I'll try and get a pic but the way the hot press is it might be difficult.

The cylinder stat at 60 hasn’t really anything to do with the solid fuel. When the stove has the rads warm, go and check the pipes at the oil boiler to see if they are warm

agusta · 14-12-2017 12:34am

Looking at the manual ,the henley Achill insert 17 kw stove.power to room 5.2kw,power to water 11.9kw.It says it is capable of heating 9 to 10 single rads.It probally only capable of running 4 double rads

I have a stanley erin stove that is connected to downstairs only.if all rads open, i get little to no heat to any of the rads.the stove is not capable of heating all of them.when i use the stove i just keep 4 double rads and one single on.i set the pipestat for stove 35.if hot water required i move stat to 65

rightjob! · 14-12-2017 7:56am

As already said turn off some of the rads and then see does that increase the performance of them.
6 double panels is 12 singles and your other 4 singles so 16 rads and hot water.i can see the stove being slightly undersized

gillad · 14-12-2017 11:14am

statto25 wrote: »

6 double panel rads and 4 of the half size double panel.

too many rads.You need a bigger stove to heat all of those

TomOnBoard · 16-12-2017 12:16am

Is the system set up to stop water flowing into the oil boiler when the stove is on? It's possible that the oil boiler is acting as a radiator when the stove is on unless it's got a valve that shuts it off while the stove is working. If it is acting as a radiator, that would leave even less of the 11kw available to the radiators themselves.

Dtp1979 · 16-12-2017 9:15am

TomOnBoard wrote: »

Is the system set up to stop water flowing into the oil boiler when the stove is on? It's possible that the oil boiler is acting as a radiator when the stove is on unless it's got a valve that shuts it off while the stove is working. If it is acting as a radiator, that would leave even less of the 11kw available to the radiators themselves.

I suggested that 2 days ago but waiting to hear back from the op

statto25 · 18-12-2017 5:16pm

Sorry folks haven't been able to do much with it since. I honestly don't know the answer to your question so I would have to ask the plumber who did the work. On a side note, I turned down the tank temp to 30 degrees and the pump stat to 50 and I seem to have more heat in the rads.

Water Roasting & Rads Lukewarm

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