T
tamz
As Oldplumber said, an unvented cylinder comes as a package of components and all components must be used in order to comply with the manufacturers instructions.
This has not been done so even if it the existing valve has been wired through the thermal cut off and will function as intended, technically is wrong, but hardly life threatening.
Any unvented cylinder must have 3 methods of temperature limit and safety control which operate in sequence as the temperature rises.
1. Thermostat
2. Non resetting thermal cut out
3. Temperature relief valve
This is in addition to any boiler safety devices which will also limit temperature.
The last failsafe is the temperature relief valve
As to where your discharge pipe is terminated.
From BS6700
"The discharge from any temperature relief valve or combined temperature and pressure relief valve or any expansion relief valve shall be located so that it is safe (i.e. it cannot create a hazard to persons in or around the building or cause damage to electrical components and wiring), and provides a visible warning of fault conditions"
Now you can see where the confusion may arise as to where it can be safely terminated with the key word being safe. There is no absolute clear guidance on this in the BS or Building Regs Part G.
On what premise did you get the two G3 qualified guys out? Generally we are not charity orginisations and if you asked them to have a look to estimate on the cost of doing work they will not offer a full free diagnosis on new done work so you can get someone else in to put it right. (well i certainly wouldn't)
If you were paying them then checks that needed to be made any work that may have needed doing would be done.
Gas safe have nothing to do with cylinders. Contact building control.
You can download the instructions easily enough from the manufacturer website.
I sympathise somewhat with your situation but ultimately, it is you, the customer, who has the final responsibility to ensure anyone carrying out work has the correct qualifications and experience.
Unfortunately very few do and base their decision on cost alone.
This has not been done so even if it the existing valve has been wired through the thermal cut off and will function as intended, technically is wrong, but hardly life threatening.
Any unvented cylinder must have 3 methods of temperature limit and safety control which operate in sequence as the temperature rises.
1. Thermostat
2. Non resetting thermal cut out
3. Temperature relief valve
This is in addition to any boiler safety devices which will also limit temperature.
The last failsafe is the temperature relief valve
As to where your discharge pipe is terminated.
From BS6700
"The discharge from any temperature relief valve or combined temperature and pressure relief valve or any expansion relief valve shall be located so that it is safe (i.e. it cannot create a hazard to persons in or around the building or cause damage to electrical components and wiring), and provides a visible warning of fault conditions"
Now you can see where the confusion may arise as to where it can be safely terminated with the key word being safe. There is no absolute clear guidance on this in the BS or Building Regs Part G.
On what premise did you get the two G3 qualified guys out? Generally we are not charity orginisations and if you asked them to have a look to estimate on the cost of doing work they will not offer a full free diagnosis on new done work so you can get someone else in to put it right. (well i certainly wouldn't)
If you were paying them then checks that needed to be made any work that may have needed doing would be done.
Gas safe have nothing to do with cylinders. Contact building control.
You can download the instructions easily enough from the manufacturer website.
I sympathise somewhat with your situation but ultimately, it is you, the customer, who has the final responsibility to ensure anyone carrying out work has the correct qualifications and experience.
Unfortunately very few do and base their decision on cost alone.