[Closed] Positive Ventilation

yes & no.

i would assume the boiler isn't venting into the loft so would it be a problem?

the boiler vents out of the gable, I was thinking of putting the PVU at the other end of the house (30ft ish).

Just bookmarking, considering a positive ventilation system to help our damp issues.

same,
although things are getting a little better atm since getting washer dryer combo.

quite a few threads on here about nuaire drimaster:

http://www.google.com/search?as_q=nuaire+drimaster&as_epq=&as_oq=&as_eq=&as_nlo=&as_nhi=&lr=&cr=&as_qdr=all&as_sitesearch=singletrackworld.com&as_occt=any&safe=images&as_filetype=&as_rights=

Had one in a previous home, cold air in winter was the only problem - switched it off eventually. If there had been some sort of heat exchange it would have fine.

I've got a PIV system fitted, had it on setting 2 all summer but started getting a little bit of condensation again now that we're drying clothes indoors again. Cranked it back up to 3 and we're condensation free again.

No boiler in the loft but I wouldn't worry about it, there should be enough ventilation in your loft already, if not you'll need to make some for the PIV to work properly

This is the previous positive ventilation thread;

http://singletrackmag.com/forum/topic/positive-pressure-ventilation-loft-units-which

There have been a number of threads on here previously about Positive Ventilation. This one is slightly different as in I assume the OP is asking about the possibilities of getting gassed to death?

the death by gassing is a worrying item on the agenda.

I really want is evidence to say its fine to do, and I think that it would work great, especially as the chimney breast goes through the loft, the loft space warms up a little with the fire on, so the cold air issue is less of an issue.

the OP is asking about the possibilities of getting gassed to death?

Report back to us once you've installed it. If we don't hear from you, we'll know why.....

Does anyone who does, have a gas boiler in the loft as well?

You haven't said if your boiler is balanced flue. If it is, it's room sealed and venting from the loft is a non issue. If it's an open vented boiler, it's a definite no no.
You need to know the answer to this and also that your boiler is in good condition and properly serviced. Modern boilers are nearly always negative pressure cases which helps even in the event of a bad seal but, I wouldn't assume anything. If you're unsure consult a gas registered plumber for advice.

Is carbon monoxide the issue or something else?

Also has anybody run both one of these and a dehumidifier, if so which was preferred/cheaper to run?

ta

Is carbon monoxide the issue or something else?

the balanced flue issue, in short I don't know enough about the boiler. It is serviced regularly by a gas safe engineer though.

The dehumidifier I am running is 200W, this is about 10W, so there is a running cost issue!

I am waiting for this to be answered by the manufacturer, so far I only have advice from the distributer, which was very cautious...the service is due soon as well, so will chat with them when here.

Cheers

[quote=yetidave ]The dehumidifier I am running is 200W, this is about 10W, so there is a running cost issue!

This is why I'm struggling to work out which way to go.

Let's say you use either a dehumidifier or a PIV system to keep the house at 50% humidity.

The dehumidifier will be using more watts than the PIV, but those watts end up heating the house. Where as the PIV system is actively bringing in cold air therefore making the central heating work harder.

It's giving me brainache TBH 😆

PIV will only ever reduce the humidity to the level of the loft/outside air. In the UK, I don't think you'll see 50% too often. Not according to my weather station anyway.

PIV will only ever reduce the humidity to the level of the loft/outside air. In the UK, I don't think you'll see 50% too often.

The dehumidifier will be using more watts than the PIV, but those watts end up heating the house. Where as the PIV system is actively bringing in cold air therefore making the central heating work harder.

But dry air is easier to heat and quicker to heat, so in theory you save money on trying to heat up 'wet' air.

Our fuel bills went down slightly, and there is no noticeable temp drop.

The PIV comes in to its own in that it circulates air, something a dehumidifier can not do.

Also

The dehumidifier will be using more watts than the PIV, but those watts end up heating the house. Where as the PIV system is actively bringing in cold air therefore making the central heating work harder.

Edit: bah, beaten to it...

for reference, the manufacturer has confirmed that if the boiler vents to outside, is in good condition with no leaks, it should not be an issue installing in the loft space.

Just to be safe though I would be putting a Carbon Monoxide (if that's what could go wrong?) alarm not far from the vent in to the house.

PIV is far more effective than a dehumidifier. Dehumidifier will do one room perfectly well but you'd need one in every single room to get similar benefits to the PIV.

Got my nuaire lurking in the utility in its box. I was hoping to get it installed be before xmas, by a hand injury has put paid to that.

Still, the complementary humidity meter that came FOC with it is proving to be a very useful educational tool in the meantime.

Already got a number of CO monitors throughout the house, with the boiler in the loft above the kids bedroom, there is one in the bedroom, one on the landing and another downstairs near the wood burner. Mostly provided free from various visits by gas inspectors etc

Still, the complementary humidity meter that came FOC with it is proving to be a very useful educational tool in the meantime.

🙂