if you want mains pressure without need for discharge, go with a boilermate from gledhill. i've fitted a couple and they're good bits of kit in my opinion.
if you want mains pressure without need for discharge, go with a boilermate from gledhill. i've fitted a couple and they're good bits of kit in my opinion.
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Or a DPS Pandorro.
No need for costly UV certification so no "criminal record".
The indirect model is fitted with a high recovery coil that allows
connection to any gas or oil boiler system. The unit is perfect for
customers wishing to swap from a standard tank fed system with
minimal effort, as the store has the same four connections - cold
in, hot out, flow from boiler, and return to boiler. The only
difference is the cold in comes from the mains rather than from
the cold tank. (DPS)
No need for costly UV certification so no "criminal record".
The indirect model is fitted with a high recovery coil that allows
connection to any gas or oil boiler system. The unit is perfect for
customers wishing to swap from a standard tank fed system with
minimal effort, as the store has the same four connections - cold
in, hot out, flow from boiler, and return to boiler. The only
difference is the cold in comes from the mains rather than from
the cold tank. (DPS)
I think that you will find that he specifies gas and plumbing systems but holds no qualifications to do any of then gas or unvented work himself!
Tony
S
sturharv
Tony, what bloody difference does that make, you ask a forum a question and you get some good information back. What is your problem??? I never said I was a fully qualified installer, and I didn't think you needed to be to use this forum.
It was a simple question, I had a good idea of the answer anyway, but its good to ask other helpful people (of which you aren't one of them)
So if you want to add anything useful, feel free, but not stupid comments like that.
I don't ask for your f**king qualifications!
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Tony is a particularly helpfull person.
S
sanj.varah
If you buy a system that is to a DIN standard, I believe its DIN 1988.
Then these systems only come with a Pressure Relieve Valve, not a Temperature and Relief Valve.
Assuming you don't have a long run of pipe you can site the pressure relief valve away from the cylinder and thus your discharge will not be affected.
Before I get flamed, The loophole in building reg G3, is the statement where it says something along the lines of if the system is approved for use by the EOTA or something like that, then you can install it.
Here's the link to the Viessmann site with a diagram. P16
http://www.viessmann.co.uk/downloads/Vitocell V-300 datasheet.pdf
Then these systems only come with a Pressure Relieve Valve, not a Temperature and Relief Valve.
Assuming you don't have a long run of pipe you can site the pressure relief valve away from the cylinder and thus your discharge will not be affected.
Before I get flamed, The loophole in building reg G3, is the statement where it says something along the lines of if the system is approved for use by the EOTA or something like that, then you can install it.
Here's the link to the Viessmann site with a diagram. P16
http://www.viessmann.co.uk/downloads/Vitocell V-300 datasheet.pdf
H
holty
one thing that most installers of unvented cylinders would know is pressure is not the main problem but the temp is.under about 2 bar the temp of boiling water is higher than 100c, when hit with atmospheric air it resorts to over boiling point 100c causing it to expand 1600 times turning to steam, with bad results.hence you will always need a temp release valve.plus building regs state anything over 15l unvented, that includes boilers, should be done so by a compotent person e.g someone with a ticket
WRc-NSF is building regulations approval
its a thermal relief valve and it designed to operate at temperature and pressure.
it isnt sufficient to relieve the pressure that wont cure the potential explosive situation.
a thermal relief valve operates thus
if temp exceeds set temperature, then it will open, and pass hot water to waste
causing cold water to enter the vessel until temp falls below set temp.
it causes the cold water to cool the vessel and move it away from the explosive temperature till the fault is rectified.
thats why not fitting this device is so potentialy dangerous.
pressure relief will on its own not prevent explosion
S
sanj.varah
when i lived in germany, my system did not have a temp valve. It was totally reliant on pressure.
Most of europe does not have the 2 port energizing device or the t&p valve.
Looking at the diagram, I dont' see how that can be a "thermal relief valve" because its on the inlet side to the cylinder. So its unlikely it will see 100 celsius
Most of europe does not have the 2 port energizing device or the t&p valve.
Looking at the diagram, I dont' see how that can be a "thermal relief valve" because its on the inlet side to the cylinder. So its unlikely it will see 100 celsius
remember it has the potential when above atmospheric pressure to heat in excess of 100c theorhetically as hi as 125c before boiling.
vent that by just a pressure relief valve you will see it instantly turn to steam @ atmospheric pressure
vent that by just a pressure relief valve you will see it instantly turn to steam @ atmospheric pressure
Sanj, you're confusing the location of the PRV with that of the T&PRV, which is in the top of the cylinder (at least in the UK). You should be very careful what you post about unvented cylinders. There may be some readers who will think that they can ignore the requirement for the T&PRV with potentially serious consequences.
Practice in Germany may be different, but they have a much more regulated and technically demanding approach to these things than we have. How many UK unvented systems get inspected every year by a competent technician? With our sloppy DIY and fit-and-forget attitudes to water heating we need more safety devices than might be the case in Germany.
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