Is multi fuel stove without vent dangerous

[Ltec]

My stove has been plumbed up to a thermal store without a vent. The plumber originally had one and the system didn't work by gravity so when he put the pump on to circulate the water it must have pumped out the vent and he just cut it off and blocked it. I got another plumber to look at it who said it's not safe don't light the stove. The owner of the thermal stores said it's ok because the thermal store has a expansion vessel and it doesn't matter unless the electric goes out.

 

[SimonG]

Thermal stores don't have expansion vessels. Any pics?

 

[Ltec]

Thermal stores don't have expansion vessels. Any pics?

 

[SimonG]

It's an unvented cylinder, which shouldn't have an uncontrolled heat source attached to it directly.

 

[Ltec]

I think it's designed for stoves. It's not high pressure

 

[townfanjon]

That looks like an unvented to me , vessels to small as well .

 

[Best]

Sounds like the plumber hadn't a clue.
And whoever from the manufacturer that said the expansion vessel is a safety feature, is an idiot.
Looks to me the primary flow is coming from overhead and therefore has to have its own vent pipe, no matter if that is actually a thermal store.
The expansion vessel does look like a stainless steel vessel for mains pipe like on some thermal stores. Needs more photos

 

[Ltec]

Sounds like the plumber hadn't a clue.
And whoever from the manufacturer that said the expansion vessel is a safety feature, is an idiot.
Looks to me the primary flow is coming from overhead and therefore has to have its own vent pipe, no matter if that is actually a thermal store.
The expansion vessel does look like a stainless steel vessel for mains pipe like on some thermal stores. Needs more photos

What part do you want the photos of

 

[Ltec]

That other pic makes it look like the pipe is coming out of the top of the vessel but it's not. Here's a better one

 

[Best]

What part do you want the photos of

Need more photos of rest of lower cylinder and its pipes.
If there is any little red headed valves (pressure relief valves - PRVs ) with pipes coming out of them (normally 2 on unvented units) and a tundish (usually black coloured plastic open fitting on a discharge pipe. Plus any large valve. All those would prove it is unvented unit, if they exist.

 

[Ltec]

Some more pics

 

[Ltec]

Well anybody know now.

 

[ShaunCorbs]

so the stove has been plumbed into a sealed format?

 

[Best]

Although it looks like an unvented cylinder, with some incorrect plumbing, it could be a vented thermal store with some sort of internal transfer coil for the mains water in (to high pressure hot out). Some thermal stores don't have an external heat exchanger.
The photos are difficult to decipher, but that looks like a vent pipe for that cylinder in middle and the expansion vessel looks like a small (stainless steel?) vessel for the mains supply pipe and coil only.
But I could be wrong, so ask the manufacturer for exact type you have.
The unit might be direct connections for the stove (they can be indirect also) and looks like your plumber altered the return to put a pump on. If the cylinder is designed for connecting a stove, then the stove pipes should have worked solely on gravity (no pump) and should have had an open vent. I assume the pump to the right side at the wall is the outlet pump to rads.
Get another heating engineer who actually knows about solid fuel pipes, as it is clear your plumber hasn't done it right.
Your manufacturer advice might have been correct about the cylinder being suitable for a stove (if it is a vented thermal store), but the statement about the lack of vent on the stove is wrong, as it requires it. Manufacturer might be confused plus inexperienced with pipework from a stove.
Only an idiot would cap that vent and add a pump on the primary return. Would be scary if pump fails!
If it is a vented and direct connections thermal store, then it is an easy set up, - stove gravitates to cylinder and radiator pump works on and off through a thermostat as heat rises and falls, but if it was an unvented unit, then a stove shouldn't be connected at all.
Let us know the manufacturer exact details of that cylinder.

 

[Best]

so the stove has been plumbed into a sealed format?

Could be a thermal store. The pump to the right is I guessed for to rads and just noticed writing on switch confirms that.
So could be stove primaries to the left, (maybe direct connections) and direct flow and return to rads on the right of cylinder.
Mains is perhaps going into an internal transfer coil for hot out. Vessel is misleading as it might be just for the mains pipework, not the cylinder.
If I guessed correct, then seems the plumber messed up with poorly done gravity piping layout for stove and added the other red pump and plugged the stove vent. Unbelievable!