Envirovent vs nuaire vs dehumidifier

Hi, I have some mold problems and am looking for a cheap solution to keep air moving more and reduce moisture in the air for a flat I rent out.

I was wondering if I can simply have a timed switch fitted to the bathroom so that it would run on maybe 20 mins after it was switched on ?

or is there a better answer ?

ideally I think it would be better to have a humidistat fan or constantly running at a low level, then faster when the light is on ?

I currently have a vent axia via 100 lt directly above the shower .

thanks in advance

Hi, I have a small1 bed flat, have mold on the walls, I have been told because of condensation .

it has electric heaters and I am not sure if the tenant uses them enough due to expense, they probably also dry clothes inside as there is no space for a tumble dryer.

i have had envirovent round that quoted a lot for a positive ventilation unit that runs constantly and heats the air slightly under 10 degrees I think .

nuaire seem to be cheaper but not installed.

both seem very expensive to me for what I think is a fan with a heater.

i think maybe vent axia do something similar. ? Not sure .

also seems to be quite large and obtrusive,but quiet and as it is drawing the air from outside as there is no loft, may not add any noticeable heat ?

does anyone have any advice on cost effective ways of providing better ventilation, ideally with minimal loss or some gain from heating ?

maybe a dehumidifier ? Are they safe ?

i wondered if I installed fan heaters near exterior wall vents, that would do a similar job of sucking air in and heating it ?

Well you’ve answered your own question. Now just to buy one. 

Most mold, in  my experience can be tracked to the lack of ventilation ..... drying clothes inside won't help matters in the slightest. Having large pieces of furniture against the outside walls is also a problem in such cases. At night, in the winter, in an unheated, unvented bedroom, just the air humans breath out will contribute to the problem.

Unless you can guarantee that the tenants will leave a window or 2 open (only a small amount needed) nothing is likely to help much

Sorry if this isn't what you want to hear

Threads merged as they are both about your ventilation problem. As Murdoch says without some easy means for fresh air to enter the building, no matter what you do trying to extract air will be fighting a losing battle.  

Doc H.

I run a dehumidifier continuously in winter. I reckon that, with modest ventilation, is the most cost effective way to avoid condensation. Cooker and shower extraction are important too.

I have wired several hundred Nuaire units for an independent specialist company (trained by the manufacturers) that does all the mechanical bits of the installation.  The units need to be installed as part of a complete ventilation solution in conjunction with appropriate bathroom/kitchen/utility extraction, otherwise you are wasting your money.  The company I sub for offers a money back guarantee if their system fails to cure the problem, and to date they have not needed to refund anyone.

As the air is less humid, customers usually report that "it feels warmer", despite the air coming from outside. 

In my experience, 90% of the problems are caused by the tenants lifestyle , exacerbated by poorly fitted cheap and nasty fans, usually feeding miles of un-insulated flexi-ducting, or frequently venting direct into the loft or floor void.

I have no experience of the Envirovent products, but have been told only their franchised installers can fit them, but don;t know if that's correct.

About 30 - 40% of the installations we do are into properties that have one or more dehumidifiers that aren't clearing the moisture.  They often appear on the local buy and sell pages shortly after the system goes in.  Read into that what you will.  

@IzzyS - are you still working for the specialist company for Nuaire? Wanted an up to date opinion.

We own a few flats in London that are let out and are struggling with the mould and damp problem. Looking at either envirovent or nuaire - can anyone give a review of either system?