cost of running mhrv

johnpawl

just wondering if anyone could tell me roughly how much their MHRV costs to run on a monthly basis. Fella that installs them round here tells me its on avg three euro a month.....thanks

ei.sdraob

ask him how many watt it uses or even better ask for the model and lookup the specs, then do the maths from there since these are on 24x7

for example i have one of these

default setting uses about 24W, with min of 10W and max of 193W

henryporter

Try Demand Control Ventilation instead - its free to run, no moving parts, no filters and does the same job - check out www.aereco.com for example (not related to the company - I'm an architect by trade)

imitation

How large is the house ? It depends on the size of the unit, the ratings I have seen range from 60w to 100w. A larger house will require a bigger HRV unit, or sometimes two HRV units.

tred

henryporter wrote: »

Try Demand Control Ventilation instead - its free to run, no moving parts, no filters and does the same job - check out www.aereco.com for example (not related to the company - I'm an architect by trade)

Henry, I am implementing this solution, but its unfair to say its free to run. You still need to expel the moist air. So there is cost there.

YouTookMyName

What does MHRV stand for?

imitation

It stands for Mechanical Heat Recovery Ventilation.

To describe it briefly, instead of vents in the wall or windows you extract the warm wet air from the house and pass it through a heat exchanger which uses to heat the incoming air which is pumped back into the house (the incoming air is not mixed with the outgoing however).

Holla23

Tred,

How do you find your Demand Control Ventilation system? Looking into whether I should install a HRV system or not and came across DCV as being an option.

Any feedback (good/bad) appreciated.

Thanks!

tred

Holla23 wrote: »

Tred,

How do you find your Demand Control Ventilation system? Looking into whether I should install a HRV system or not and came across DCV as being an option.

Any feedback (good/bad) appreciated.

Thanks!

Hi. Mine will be commissioned this week. ITs very straightforward. Your removing all the wet air from bathroom, kitchen area/ utility, ducted to a small fan in the attic, which passes it outside. Then in the habitable rooms, we have vents, that regulate the amount of air they let in based on need. Its an easy system to do yourself, so costs were saved there. Only running cost will be the fan in the attic. Its just another solution. Its
not dirt cheap, but if you have an air tight house, its another way of regulating air changes.