No hot water when heating is on.

[jonpeck]

The problem is when the gas central heating is on I get very little hot water out the shower. When the heating is off there is plenty of hot water.

I have set the thermostat to have the hot water come on a hour first to the heating a vi've versa.

It's a potterton superprima and mixer gravity Fed shower.

Thanks in advance.

 

[jtsplumbing]

Do you only get this problem when using the shower ? are the rest of the taps ok or do these quickly run out of hot water to ? if other outlets are ok then fault is with shower.

 

[jonpeck]

I have tried just letting the hot water heat up for the shower with no central heating on and it comes out perfect. Only when the two are running at the same time that its lukewarm/cold. Its built In mixer shower.

I presume this would eliminate the shower?

I can run a bowl of hot water fine with the heating on.

 

[Worcester]

Split coil on the cylinder?

 

[Ermintrude]

Balancing issue, changed rads or meddled with anything?

 

[spanner]

Has it always Been doing it..! Hot water heating off - warm water heating on..?

 

[jtsplumbing]

Is this a combi boiler ? or do you have a hot water tank ?

 

[jonpeck]

Not meddled with anything. I have never really noticed it until recently due to been at home instead of work for a long period of time.

It's a rented property and just trying to maybe narrow the problem down to report this to thw landlord. As much information as possible really. Or just to check I'm not missing something obvious. The boiler fires up fine etc

 

[Howsie]

A hot tank at a guess judging by the initial description "Hot water on for a hour first"

 

[spanner]

That's quite easy to understand. If the system is gravity fed and not fully pumped then without a programmer its either / or. So this is how your hot and and heating system works! Is to preheat the hot cylinder by t

 

[spanner]

Do you have to operate a manual valve for hot water.. or is there a programmer..?

 

[spanner]

Central heating hot water you can't be having both working the same time .. not with that system

 

[happyflyer]

The problem is when the gas central heating is on I get very little hot water out the shower. When the heating is off there is plenty of hot water.

I have set the thermostat to have the hot water come on a hour first to the heating a vi've versa.

It's a potterton superprima and mixer gravity Fed shower.

Thanks in advance.

Jon,

to get a spot on answer to your question these guys here need a lot more information from you, like this.

1) do you have a hot water cylinder, I take you have with this comment " I have set the thermostat to have the hot water come on a hour first to the heating a vi've versa"
2) do you mean the flow of hot water to the shower is bad or the temperature is low
3) has this just happened or as it always been like this since you moved in
4) If you run the kitchen tap and the heating is on is the water temp low then

I will think of some more in a minute my head hurts just now! Answer these first

Tony

 

[spanner]

Sounds like a combi with the hot water bottle added to the heating system... Shift+R improves the quality of this image. Shift+A improves the quality of all images on this page.

 

[Ermintrude]

Sounds like needs to call landlord. £5k fine comming in 2018 for every inefficient heating system. If they mention it now landlord might have it sorted by 2028!

 

[TBServices]

Never understand why tenants bother posting on here.

You're not paying so ring the landlord!

 

[happyflyer]

Never understand why tenants bother posting on here.

You're not paying so ring the landlord!

Could not agree more

 

[kay-jay]

That's quite easy to understand. If the system is gravity fed and not fully pumped then without a programmer its either / or. So this is how your hot and and heating system works! Is to preheat the hot cylinder by t

Nope.
Gravity hot water means seperate unpumped supply from boiler to cylinder coil. On this system his hot water cylinder would heat up regardless of the heating being on.

He is therefore likely to be on an s or a y plan with two pipe boiler. As already suggested from the description given its likely to be a balancing issue. Hot water only means heating valve shut and circuit pumps through the coil and gives piping hot water. With demand for both the water takes the path of least resistance which is through the heating circuit to the detriment if the coil.

 

[kay-jay]

Central heating hot water you can't be having both working the same time .. not with that system

Wtf you on about?

 

[happyflyer]

Slow down guys getting all heated more than the OP shower, the OP might be telling us half a tale, most do, attention to detail will short this problem out
but we ain't got the detail yet, have a little patience and don't use the scatter gun approach, but like some said he should be talking to the millionaire landlord
not us down and outs.

 

[spanner]

Only trying to retrieve more information.... was my approach... erk! no tale tales

 

[happyflyer]

Only trying to retrieve more information.... was my approach... erk! no tale tales

Spanner,

I think we need a standard questionnaire sheet all encompassing, then if the OPS don't fill them in they don't get an answer, someone would break ranks
and still have a guess, what do you think?

 

[spanner]

Wtf you on about?

Sounds like an old C plan and not S plan!! Er guess!

 

[happyflyer]

Sounds like an old C plan and not S plan!! Er guess!

There you go Spanner, you just broke ranks, guessing again, this forum is like "THE CHASE" :13: are the tubes running this morning, I guess there not!

 

[spanner]

No tubes running until 2100 hrs tonight, then back to normal tomorrow.. sadly I heard the same practice in next week as well.. hopefully not because traffic momentum is like pica dilly