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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Not very hot DHW - Any ideas?
My hot water tank has stopped getting properly hot. The heating is
working fine, so it's unlikely to be a boiler issue. The pump seems OK and the thermostat ~seems~ to be operating fine (on the basis of a click as you turn the knob). There's no air in the circuit judging by the bleed valve. I'm tempted to replace the thermostat, just cos I can, but I'm not convinced that's going to achieve anything. Any (sensible) suggestions would be appreciated. Standard open vented indirect tank and boiler with nothing fancy like weather compensation etc. No recent issues. DHW timer set to run when the heating is off. Cheers people |
#2
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Not very hot DHW - Any ideas?
On 28/02/2021 14:42, GMM wrote:
My hot water tank has stopped getting properly hot.Â* The heating is working fine, so it's unlikely to be a boiler issue.Â* The pump seems OK and the thermostat ~seems~ to be operating fine (on the basis of a click as you turn the knob).Â* There's no air in the circuit judging by the bleed valve.Â* I'm tempted to replace the thermostat, just cos I can, but I'm not convinced that's going to achieve anything. Any (sensible) suggestions would be appreciated. Standard open vented indirect tank and boiler with nothing fancy like weather compensation etc. No recent issues.Â* DHW timer set to run when the heating is off. Cheers people Can you feel hot water entering the DHW coil as and when it should? PA |
#3
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Not very hot DHW - Any ideas?
On Sunday, 28 February 2021 at 14:50:08 UTC, Peter Able wrote:
On 28/02/2021 14:42, GMM wrote: My hot water tank has stopped getting properly hot. The heating is working fine, so it's unlikely to be a boiler issue. The pump seems OK and the thermostat ~seems~ to be operating fine (on the basis of a click as you turn the knob). There's no air in the circuit judging by the bleed valve. I'm tempted to replace the thermostat, just cos I can, but I'm not convinced that's going to achieve anything. Any (sensible) suggestions would be appreciated. Standard open vented indirect tank and boiler with nothing fancy like weather compensation etc. No recent issues. DHW timer set to run when the heating is off. Cheers people Can you feel hot water entering the DHW coil as and when it should? PA Faulty valve or diverter Richard |
#4
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Not very hot DHW - Any ideas?
GMM used his keyboard to write :
Standard open vented indirect tank and boiler with nothing fancy like weather compensation etc. No recent issues. DHW timer set to run when the heating is off. Has the boiler flow temperature been reduced? Check the cylinder stat temperature setting? Check the HW time clock is on for long enough? Check an HW tap has not been left on. |
#5
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Not very hot DHW - Any ideas?
Harry Bloomfield, Esq. explained :
Check an HW tap has not been left on. Check the 3-port valve is properly switching to heat the cylinder. |
#6
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Not very hot DHW - Any ideas?
On 28/02/2021 15:28, Chris Hogg wrote:
On Sun, 28 Feb 2021 14:42:21 +0000, GMM wrote: My hot water tank has stopped getting properly hot. The heating is working fine, so it's unlikely to be a boiler issue. The pump seems OK and the thermostat ~seems~ to be operating fine (on the basis of a click as you turn the knob). There's no air in the circuit judging by the bleed valve. I'm tempted to replace the thermostat, just cos I can, but I'm not convinced that's going to achieve anything. Any (sensible) suggestions would be appreciated. Standard open vented indirect tank and boiler with nothing fancy like weather compensation etc. No recent issues. DHW timer set to run when the heating is off. Cheers people What sort of DHW/CH system is it? S-plan: https://tinyurl.com/yaxejpa6 ? or Y-plan: https://tinyurl.com/yd69szy9 ? If the first, the zone valve in the DHW circuit on the LHS in the diagram may have failed, or the controller isn't sending the 'open valve' signal correctly. If the second, the mid-position valve may not be working properly and be stuck in the CH position. I've puzzled over those sort of diagrams in the past and neither fits the situation precisely, but I suppose the S-plan is the closer (mine splits to two separate pumps, with a valve on the heating circuit after its pump. No valve on the DHW side apart from the thermostat-controlled bypass) So far as I can tell, both valves are operating correctly, as are both pumps, which is why I'm a bit lost in terms of th mechanical side of it.... |
#7
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Not very hot DHW - Any ideas?
On 28/02/2021 14:50, Peter Able wrote:
On 28/02/2021 14:42, GMM wrote: My hot water tank has stopped getting properly hot.Â* The heating is working fine, so it's unlikely to be a boiler issue.Â* The pump seems OK and the thermostat ~seems~ to be operating fine (on the basis of a click as you turn the knob).Â* There's no air in the circuit judging by the bleed valve.Â* I'm tempted to replace the thermostat, just cos I can, but I'm not convinced that's going to achieve anything. Any (sensible) suggestions would be appreciated. Standard open vented indirect tank and boiler with nothing fancy like weather compensation etc. No recent issues.Â* DHW timer set to run when the heating is off. Cheers people Can you feel hot water entering the DHW coil as and when it should? PA It feels hot but of course I haven't held onto the pipe for the full time the boiler is running.... |
#8
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Not very hot DHW - Any ideas?
On 28/02/2021 15:07, Tricky Dicky wrote:
On Sunday, 28 February 2021 at 14:50:08 UTC, Peter Able wrote: On 28/02/2021 14:42, GMM wrote: My hot water tank has stopped getting properly hot. The heating is working fine, so it's unlikely to be a boiler issue. The pump seems OK and the thermostat ~seems~ to be operating fine (on the basis of a click as you turn the knob). There's no air in the circuit judging by the bleed valve. I'm tempted to replace the thermostat, just cos I can, but I'm not convinced that's going to achieve anything. Any (sensible) suggestions would be appreciated. Standard open vented indirect tank and boiler with nothing fancy like weather compensation etc. No recent issues. DHW timer set to run when the heating is off. Cheers people Can you feel hot water entering the DHW coil as and when it should? PA Faulty valve or diverter Richard They seem to b operating OK in terms of opening/closing when given a signal... |
#9
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Not very hot DHW - Any ideas?
On 01/03/2021 11:46, GMM wrote:
On 28/02/2021 15:07, Tricky Dicky wrote: On Sunday, 28 February 2021 at 14:50:08 UTC, Peter Able wrote: On 28/02/2021 14:42, GMM wrote: My hot water tank has stopped getting properly hot. The heating is working fine, so it's unlikely to be a boiler issue. The pump seems OK and the thermostat ~seems~ to be operating fine (on the basis of a click as you turn the knob). There's no air in the circuit judging by the bleed valve. I'm tempted to replace the thermostat, just cos I can, but I'm not convinced that's going to achieve anything. Any (sensible) suggestions would be appreciated. Standard open vented indirect tank and boiler with nothing fancy like weather compensation etc. No recent issues. DHW timer set to run when the heating is off. Cheers people Can you feel hot water entering the DHW coil as and when it should? PA Faulty valve or diverter Richard They seem to b operating OK in terms of opening/closing when given a signal... When the DHW circuit is pumping, how hot are 22mm pipes feeding the tank ?. Do you have a clip-on thermometer or one of those laser ones to see what temp of water is arriving and leaving the tank. |
#10
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Not very hot DHW - Any ideas?
On 01/03/2021 11:45, GMM wrote:
On 28/02/2021 14:50, Peter Able wrote: On 28/02/2021 14:42, GMM wrote: My hot water tank has stopped getting properly hot.Â* The heating is working fine, so it's unlikely to be a boiler issue.Â* The pump seems OK and the thermostat ~seems~ to be operating fine (on the basis of a click as you turn the knob).Â* There's no air in the circuit judging by the bleed valve.Â* I'm tempted to replace the thermostat, just cos I can, but I'm not convinced that's going to achieve anything. Any (sensible) suggestions would be appreciated. Standard open vented indirect tank and boiler with nothing fancy like weather compensation etc. No recent issues.Â* DHW timer set to run when the heating is off. Cheers people Can you feel hot water entering the DHW coil as and when it should? PA It feels hot but of course I haven't held onto the pipe for the full time the boiler is running.... If your boiler is supplyng water at 80+ C then it wouldn't 'feel' hot, it would be 'ouch, fkit' hot. Can you check your 3way valve and make sure it is operating properly ?. |
#11
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Not very hot DHW - Any ideas?
On Monday, March 1, 2021 at 2:40:23 PM UTC, Andrew wrote:
It feels hot but of course I haven't held onto the pipe for the full time the boiler is running.... If your boiler is supplyng water at 80+ C then it wouldn't 'feel' hot, it would be 'ouch, fkit' hot. Can you check your 3way valve and make sure it is operating properly ?. Yup - that's about the temperature (!) I'll see if I can get my IR thermometer on it later and find out roughly what 'ouch fkit hot' equates to.... |
#12
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Not very hot DHW - Any ideas?
On 01/03/2021 11:43, GMM wrote:
the thermostat-controlled bypass Can you explain this? A bypass of what? PA |
#13
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Not very hot DHW - Any ideas?
On 01/03/2021 16:29, Glenn Matthews wrote:
Yup - that's about the temperature (!) I'll see if I can get my IR thermometer on it later and find out roughly what 'ouch fkit hot' equates to.... IR thermometers aren't very accurate on shiny pipes. You might want to stick some opaque tape on it. See https://www.flukeprocessinstruments.com/en-us/service-and-support/knowledge-center/infrared-technology/what-is-emissivity AKA https://tinyurl.com/ybwqfn36 Andy |
#14
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Not very hot DHW - Any ideas?
On Monday, 1 March 2021 at 19:16:03 UTC, Peter Able wrote:
On 01/03/2021 11:43, GMM wrote: the thermostat-controlled bypass Can you explain this? A bypass of what? PA Yes! The cylinder should be controlling a valve. Bypass that I am familiar with have no electrical connection being simple mechanical devices that you set separate on the bypass. |
#15
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Not very hot DHW - Any ideas?
On 02/03/2021 11:30, Tricky Dicky wrote:
On Monday, 1 March 2021 at 19:16:03 UTC, Peter Able wrote: On 01/03/2021 11:43, GMM wrote: the thermostat-controlled bypass Can you explain this? A bypass of what? PA Yes! The cylinder should be controlling a valve. Bypass that I am familiar with have no electrical connection being simple mechanical devices that you set separate on the bypass. Had to read that a couple of times. The plural of Bypass is Bypasses. As you describe, relatively dumb, set and forget components - which could be in parallel with the DHW coil. If so, and set fully open, problem identified - maybe! Any response, GMM ? PA |
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