Frequently Asked Dehumidifier Questions

 Many of your questions can be answered by reading our Frequently Asked Questions.

Q.         Where do I position the dehumidifier?

Q.         Is it easy to move around?

Q.         Do I need to use it in summer?

Q.         The specifications indicate that a dehumidifier can extract 20 litres per day yet the container only holds 4 litres? What happens if we have a power failure, will the machine turn itself back on?

Q.         I bought a dehumidifier and it runs all the time - why?

Q.         Do dehumidifiers raise the heat in my house?

Q.         I have a second home. What happens if we have a power failure, will the machine turn itself back on?

Q.         Can a dehumidifier cover multiple connected rooms?

Q.         Does it filter the air?

Q.         How quiet will it be?

Q.         Do I need to buy new Air Filters?

Q.         What are decibels?

Q.         Can I have a permanent drain fitted?

Q.         How does the permanent drain work?

Q.         What if the hose becomes blocked?

Q.         Can I wall mount a dehumidifier?

Q.         Does a dehumidifier tell me my exact humidity level?

Q.         I still have condensation on windows though my dehumidifier has stopped – why?

Q.         How long will it take to get my condensation under control?

Q.         What causes condensation?

Q.         I have mould & mildew so will a dehumidifier get rid this?

Q.         What is the difference between a dehumidifier with a compressor and one without?

Q.         Do I need to change or replace the Silica on the XDry or Ruby Dry?

Q.         Is room size important when choosing a dehumidifier?

Q.         Can I dry clothes with a dehumidifier?

Q.         Will just one dehumidifier be sufficient for my home?

Q.         Which dehumidifier do I need for my garage?

Q.         Do I need to leave heating on when operating my dehumidifier?

Q.         Can I run the dehumidifier at night?

Q.         Do I have to leave the dehumidifier running constantly?

Q.         What are the running costs?

Q.         Do all dehumidifiers have a humidity control?

Q.         What is the ideal humidity level for my home?

Q.         How do I measure humidity?

Q.         Why does my dehumidifier freeze up?

Q.         Do all dehumidifiers have a water container?

Q.         Will the dehumidifier switch off when the tank is full?

Q.         When will delivery be?

Q.         Saturday Delivery?

Q.         Do I need so be in to receive the dehumidifier?

 

Q.         Where do I position the dehumidifier?

A.         Position the dehumidifier centrally in a home either in a hallway or perhaps on the landing. If you have a problem area then move the dehumidifier to that area.

 

Q.         Is it easy to move around?

A.         Generally yes as long as you are fit and able as all dehumidifiers have either a carrying handle (please refer to the particular model for weight and dimensions). Also castors are available for the Ebac 2000 & 6000 series of Dehumidifiers. Daitsu Dehumidifiers have rear recessed rollers.

 

Q.         Do I need to use it in summer?

A.         Generally no advantage unless you have condensation on surfaces. In summer, you may have doors and windows open so there is no advantage in using the dehumidifier.

 

Q          The specifications indicate that a dehumidifier can extract 20 litres per day yet the water container only hold 4 litres?

A.         Maximum extraction rates are based on temperatures of either 32 deg C & 90% RH or 30 deg C & 80% RH. In the real world conditions within the UK it reasonable to expect a maximum of around 4 or 5 litres per day as the extract rates decrease with a drop in temperature.

 

Q.         I bought a dehumidifier and it runs all the time - why?

A.         The dehumidifier that you purchased is probably not capable of removing the amount of moisture in this area. If your area needs to have 50 pints of moisture removed from it daily and you have a 40-pint unit, you will never catch up and the machine will run continuously.

 

Q.         Do dehumidifiers raise the heat in my house?

A.         Yes, but this can be either good or bad. The warmer the room, the easier and more efficiently you can remove moisture so the machine will have to work less. Depending on the size of the room, you could raise the temperature by 5– 10 degrees particularly if you use a desiccant dehumidifier.

 

Q.         I have a second home. What happens if we have a power failure, will the machine turn itself back on?

A.         That depends on the brand and model that you buy. Most dehumidifiers with manual humidistat controls will turn themselves back on. With the electronic controls, it varies. The EbacDD322FW "Simple, DD122FW MK3 and Meaco MEA10L units will turn back on and will continue to remove moisture at the humidity level for which you had set the machine. The Ruby Dry dehumidifiers will not turn back on and need to have the "on" button pushed to restart, and while it is a quiet and excellent machine, it would not be a good choice for a second home or if you plan to be away from your house for extended periods.

Q.         Can a dehumidifier cover multiple connected rooms?

A.         That depends on the total square footage of all the rooms, the configuration of the rooms, and the openness between the rooms. The more open the rooms are to each other (not 3’ doorways), the easier it is. Having ceiling fans in the rooms to move the air would certainly help. If you don’t have ceiling fans you can add small, inexpensive fans in the rooms to help move the air in these satellite rooms into the main area where you have placed the dehumidifier.

 

Q.         Does it filter the air?

A.         All machines have an air filter mainly to protect the machine.  If you specially want clean air then please look at the Daikin MC70L Air Purifier

 

Q.         How quiet will it be?
A.         Each make and model may differ in sound levels that are measured in (dBA). The higher

the (dBA) the higher the sound level. Remember, an increase in 6(dBA) is a doubling of sound

 

Q.         Do I need to buy new Air Filters?

A.         You should replace the air filters on Ebac machines every few months. Some general-purpose filters can be Vacuum or even washed out. Daitsu & Mitsubishi filters can be brushed or washed. The Mitsubishi Photocatalytic filter can be washed a number of times but should be changed every 2 years. The filters on the Ruby Dry including the Carbon Filter require checking & cleaning every two weeks and should be changed at least once per year. Do not allow an air filter to become blocked on any dehumidifier otherwise premature failure can occur.

           

Q.         What are decibels?

A.        

 

Q.         Can I have a permanent drain fitted?

A.         Yes, permanent drain kits are available for the Ebac range. The DD322 range require a ½” i.d. hose and the Ruby Dry require a 15mm i.d. hose.

 

Q.         How does the permanent drain work?

A.         The hose connects to a drain point on the dehumidifier and the hose outlet must be lower than the dehumidifier drain point.

 

Q.         What if the hose becomes blocked?

A.         The water would then go back into the integral tank and once full will switch off the dehumidifier.

 

Q.         Can I wall-mount a dehumidifier?

A.         We do not offer a wall mounted domestic dehumidifier. However we do offer a range of Commercial wall mounted dehumidifiers.

 

Q.         Does a dehumidifier tell me my exact humidity level?

A.         Purchasing a Thermo-hygrometer is recommended so you can measure relative humidity and compare it with the setting on your dehumidifier. 
 

Q.         I still have condensation on windows though my dehumidifier has stopped – why?

A.         Either you have the setting on the dehumidifier too high or the dehumidifier is under sized. While a relative humidity level of 50% may be ideal for your home, you may have to lower the level in periods of colder weather and make your dehumidifier work harder.

 

Q.         How long will it take to get my condensation under control?

A.         This depends on the level of the problem. Generally, you will see an improvement within a few days but do allow 1- 2 weeks to get the problem under control.

 

Q.         What causes condensation?

A.         In Britain, condensation in houses is mainly a winter problem particularly where warm moist air is generated in living areas and then penetrates to the colder parts of the building.

 

The moisture in the air comes from a number of sources within the house. Water vapour is produced in relatively large quantities from normal day to day activities - a 5 person household puts about 10 kg of water into the air every day (without taking into account any heating) - i.e.

 

- breathing (asleep) 0.3 kg

- breathing (awake) 0.85 kg

- cooking 3 kg

- personal washing 1.0 kg

- washing and drying clothes 5.5 kg

- heating - especially paraffin and flue-less gas heaters. For every litre of paraffin burnt over one litre of moisture vaporizes into air. Every carbon fuel produces some amount of water from combustion.

    * (1 kg of water equates to about 1 litre)

 

Moisture can also be drawn from the structure of the building into the internal air; from below the floor or through the walls/ceilings.

 

Q.         I have mould & mildew so will a dehumidifier get rid this?

A.         Yes, a dehumidifier will help prevent further problems but you must use a mould spore remover to actually kill the spores.

 

Q.         What is the difference between a dehumidifier with a compressor and one without?

A.         Traditionally dehumidifiers worked on the refrigeration principle where air passed over a cold refrigerated coil and moisture condensed on the coil and drained into a container. The compressor-less adsorbent machines such as Ruby Dry EcoAir DD122 & 322 Dehumidifiers work on the principle of moist air being drawn into an absorber that is a slowly rotating disc impregnated with silica. A heating element applies heat to the adsorber that heats the moisture to a high temperature vapour that immediately condenses into water.

Q.         Do I need to change or replace the Silica on the EcoAir or Ruby Dry?

A.         No, there is nothing to replace

 

Q.         Is room size important when choosing a dehumidifier?

A.         Yes and no. What is most important is the amount of water you need to take out of the air. The more water in the air, the larger the capacity you will need. A small room with a lot of moisture may need as much dehumidification as a large room with average moisture content. When in doubt, it's always better to oversize a dehumidifier.

Q.         Can I dry clothes with a dehumidifier?

A.         Yes you can. Ideally place your clothes on a drying rack and place the dehumidifier in the same room and leave on a continuous or Laundry setting. Shut the door to that area and the dehumidifier will take in all moisture. The EcoAir Desiccant machines all have a Laundry setting. The Ruby Dry is also excellent for this purpose. These machines have a high airflow to assist with the drying.

 

Q.         Will just one dehumidifier be sufficient for my home?

A.         Normally one will be sufficient but in the case of very large houses or where you may have several floor then more than one may be required

 

Q.         Which dehumidifier do I need for my garage?

A.         Garages are generally unheated so consider the Adsorption dehumidifier such as the DD322FW "Simple" or Ruby Dry as these operate in low temperatures without losing extraction capacity. Larger Garages may need more than one machine or the use of a Commercial Dehumidifier.

 

            Very large car storage areas, warehouses etc should consider commercial dehumidifiers.

 

Q.         Do I need to leave heating on when operating my dehumidifier?

A.         The warmer the air the easier it is to extract moisture. Using a Ruby Dry or EcoAir DD122 or the larger DD322 is ideal if the temperature is generally on the colder side as these machines maintain extraction rates regardless of internal temperature.

 

Q.         Can I run the dehumidifier at night?

A.         Yes you can but be aware that there will always be a sound from the machine when it is operating. Choose a quiet dehumidifier if it is to be used near bedrooms.

 

Q.         Do I have to leave the dehumidifier running constantly?

A.         All dehumidifiers are fitted with a humidistat that controls the operation of the machine. When the humidity level is satisfied, the dehumidifier will switch off though some machines allows the circulation fan to continue.

 

Q.         What are the running costs?

A.         Check the wattage of the dehumidifier specification. Currently 1000w of electricity will cost you around 12-15 pence per hour. Therefore a machine rated at 250w will cost you a quarter of a kW so allow around 3-4 pence per hour if running continuously though adsorption machines will have a higher cost. However, the adsorption machines such as Ruby Dry & EcoAir will do the job quicker at temperatures below 16 deg C and therefore overall costs may be less than with a conventional dehumidifier.

 

            Once the house is brought under control the actual running costs will be reduced, as the dehumidifier will need to operate less.

 

Q.         Do all dehumidifiers have a humidity control?

A.         Yes they have. The Ebac 2000 range has auto and manual control. The Ruby Dry has a setting of 40/50/60 %RH. The DD122FW "Simple" & the DD322FW "Simple" have a rotary variable humidistat. 
 

Q.         What is the ideal humidity level for my home?

A.         Between 40 and 60% so the ideal would be 50% but may need to be lower in very cold weather.

 

Q.         How do I measure humidity?

A.         We supply a desktop digital thermo-hygrometer that displays current temperature and relative humidity.

 

Q.         Why does my dehumidifier freeze up?

A.         The coils of refrigerated dehumidifiers will ice up but a sensor or timer will stop the compressor and allow the ice to melt. This is normal but severe icing up can be due to a shortage of refrigerant, insufficient airflow or a malfunction.

 

Q.         Do all dehumidifiers have a water container?

A.         Yes, all domestic dehumidifiers have a container that ranges from 3.5 liters to 5.5 liters capacity.

 

Q.         Will the dehumidifier switch off when the tank is full?

A.         Yes, all tanks are fitted with a float switch so once full they will shut off the compressor.

 

Q.         When will delivery be?

A.         If you order prior to 1pm on any working day you will normally receive the machine the following working day. However, deliveries to the Highland & Islands or to Northern Ireland may take 2/3 days.

 

Q.         Saturday Delivery?

A.         We can arrange delivery on a Saturday for an additional cost of £25

Q.         Do I need so be in to receive the dehumidifier?

A.         No, as long as you have a safe place where it can left and give us your permission along with leaving a note with your signature for the delivery company. We can also arrange delivery to your workplace if that is more convenient to you.