Quest

Quest DEH 3000R Digital Controller

£250.00 £237.50 Save 5%
Tax included. Shipping calculated at checkout.
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Pickup available at Bansley Store

Usually ready in 24 hours

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Shipping & Returns

Our current shipping rates are as follows:

  • UK Orders Over £95.00 – Free Next Day Delivery
  • UK Orders Under £95.00 – £8.95 For Next Day Delivery With DX Or We Offer Tracked 48 & 24 Services With Royal Mail
  • UK Orders Next Day AM – £20
  • UK Orders Saturday AM – £30
  • International Orders DAP – We can ship worldwide - Please note that any customs fees, import taxes or duties are the responsibility of the customer.

All parcels are fully tracked. Once your order has been dispatched, you’ll receive an email containing your tracking number.

If your order is classed as an oversized item OR deemed extra heavy, additional heavy shipping duty will be added at checkout when selecting your shipping options.

Returns

We want you to be completely satisfied with your purchase, but if you change your mind, you may cancel your order within 14 days of receipt for a full refund, provided the items are unused and in resalable condition.

Once your cancellation has been confirmed, you must return the items within 14 days, ideally in their original packaging.

Click & Collect

Order online and collect directly from our Sheffield OR Barnsley store. Once your order is ready, you’ll receive an email or phone confirmation with collection details. Please wait for confirmation before travelling to ensure your order is prepared.

Please have your order number ready to give to a member of staff when you arrive.

Sheffield Store:
GSH Retail Ltd
Unit 5, 230 Woodbourn Road
Sheffield
S9 3LQ

Barnsley Store:

GSH Retail Ltd
Unit 6, Rockingham Business Park
Rockingham Row, Birdwell
Barnsley, S70 5TW

Local Same Day Delivery Service

Our man in a van!

Same-Day Delivery Service

Enjoy fast, reliable, and fully discreet same-day delivery with Green Spirit when you order from our Sheffield store area.Whether you shop online or
in-store, we make getting your items easy,convenient, and secure.

Order Online

When placing your order through our website, simply select the Same-Day Local Delivery option at checkout.

  • Free Same-Day Delivery on orders over £250.00
  • Available customers within a 3-mile radius of our Sheffield store (S9 3LQ)
  • Orders under £250.00 can still be delivered the same day for a £50.00
    flat fee

Your order will be prepared and delivered directly to your
door the very same day, using our discreet delivery service.

Order In-Store

If you prefer to shop in person, visit our Sheffield
location to browse, purchase, and arrange delivery.

  • Pay
    in full for your items in-store
  • Choose
    a delivery time and date that suits you best
  • Our
    team will ensure a smooth and convenient handover

Discreet Delivery Promise

We understand the importance of privacy.

  • All
    our delivery vans are plain and unmarked, with no company
    branding
  • Parcels
    are packaged in plain or black wrapping for complete discretion

Delivery Requirements

To ensure everything runs smoothly:

  • Customers
    must be present at the agreed delivery time
  • Drivers
    cannot wait for extended periods
  • If
    the customer is not available, items will be returned to the store and a £50.00
    redelivery fee
    will apply

Upon
delivery, we will request a order number, name and signature to
confirm receipt

Discreet Shipping

All orders from GSH Retail Ltd are packed securely and shipped in Plain unbranded boxes for your privacy. We understand that discretion is important, so no external markings or product details are visible on the packaging.

Each parcel is also wrapped in durable black film and sealed with fragile tape to ensure both security and protection in transit.

We take great care to make sure your order arrives safely, discreetly, and in perfect condition — every time.

Methods Of Payment

We accept a wide range of secure payment options for your convenience when shopping with GSH Retail LTD

You can pay using:

Visa, Mastercard, American Express, and Discover

Apple Pay, Google Pay, and Shop Pay

PayPal – Fast and secure online checkout with buyer protection

Klarna – Flexible payment options, including Pay in 3 instalments or Pay Later

Clearpay – Split your purchase into four interest-free payments

Weston Union– Supported for international customers

Cash In The Post - This is at your own risk! Please make sure it is signed for, tracked, and insured.

Manual Bank Transfer - Contact a member of staff to organise paying via bank transfer.

All transactions are processed securely through Shopify’s encrypted checkout. Your payment details are never shared directly with us.

Once your order is placed, you’ll receive an order confirmation email, followed by tracking details once your parcel has been dispatched.

Finance Options

We offer flexible finance options to make purchasing easier. You can choose to spread the cost of your order, all three options are interest-free and give you the flexibility to manage your payments in a way that suits you.

PayPal Pay in 3

PayPal Pay in 3 allows you to divide your purchase into three equal interest-free payments over two months. The first payment is made at checkout, followed by two automatic payments each month.
It is available on orders between £30 and £2,000, and approval is completed instantly through your PayPal account. You can view, manage, or make payments easily through the PayPal app or your online account.

Shop Pay

Shop Pay Installments lets customers pay for an order in smaller increments over time.When available, Shop Pay Installments is a great option to help you maximize your budget for orders between the following amounts, depending on your location:


Klarna


Klarna offers two flexible ways to pay. With Pay in 3 instalments, your order total is divided into three equal payments, taken every 30 days with no interest or fees when paid on time. Alternatively, you can choose Pay Later in 30 Days, allowing you to receive your order first and settle the balance within 30 days. Klarna provides instant approval at checkout, and all payments can be managed securely through the Klarna app.

Clearpay

Clearpay lets you spread the cost of your purchase into four equal interest-free payments, taken automatically every two weeks. The first instalment is paid at the time of purchase, and the remaining three are collected automatically over six weeks. Clearpay is available for orders between £30 and £1,000 and can be managed easily through the Clearpay app.

Important Information

All finance options are subject to eligibility and approval by the provider. Late or missed payments may affect your credit score, so please ensure funds are available when payments are due. For details about eligibility, limits, or payment schedules, please refer to the provider’s website or app.

Earning Points & Rewards

At GSH Retail we believe loyalty should be rewarded - Our Points & Rewards scheme allows you to collect points every time you shop and redeem them for discount codes to use on future purchases.

When you make a purchase through our website, you’ll automatically earn points based on the value of your order. These points are added to your account and can be saved or redeemed whenever you choose. Once you’ve collected enough points, you can exchange them for a unique coupon code that can be applied at checkout to reduce the cost of your next order.

Earn 5 Points for every £1 spent
Redeem 100 Points for £1 Store Credit

Your points never expire as long as your account remains active, and you can track your balance easily through your customer account dashboard. It’s our way of saying thank you for choosing GSH Retail Ltd

To redeem your points, simply log into your account, view your available balance, and follow the on-screen instructions to generate a discount code. Enter the code at checkout to instantly apply your reward.

Quest DEH 3000R Digital Humidity Controller with Remote Sensor

Quest DEH 3000R is a professional wall-mounted digital humidity controller designed for compatible Quest dehumidifiers. Featuring a separate remote sensor, digital relative humidity control and advanced ventilation functions, it gives growers and commercial users greater control over their environment from one central interface.

The DEH 3000R allows you to monitor and control relative humidity while also providing functions for fan operation, ventilation timing and system integration. Its remote sensor can be positioned away from the main controller, allowing humidity to be measured from a more representative location within the controlled environment.

Designed for use with a wide range of Quest commercial and horticultural dehumidifiers, the DEH 3000R is ideal for applications where consistent humidity management is critical.

Key Features & Benefits

  • Digital humidity control: Monitor and control relative humidity from a central wall-mounted controller.
  • Remote humidity sensor: Allows the sensing point to be positioned separately from the control panel.
  • Humidity control range: Adjustable from 35% to 70% RH.
  • Wide humidity monitoring range: Monitors approximately 10% to 95% RH.
  • Large backlit LCD: Clear display for settings and system information.
  • Fan control: Provides direct control and integration with compatible system fans.
  • Ventilation management: Includes programmable fresh-air ventilation functions.
  • Dry-out cycle timer: Additional control for specialist drying applications.
  • High-temperature cut-out: Adds temperature-based protection to the control system.
  • Automatic reboot: Designed to restore operation following a power interruption.
  • Low-voltage operation: Operates from a 24VAC control supply.
  • Wide Quest compatibility: Supports numerous Quest commercial and 50Hz dehumidifier models.

Precise Digital Humidity Management

The Quest DEH 3000R allows the user to select a desired relative humidity level and automatically control the connected dehumidifier according to environmental conditions.

The controller has a published humidity control range of 35% to 70% RH, with a broader sensing range of approximately 10% to 95% RH.

This gives growers and facility operators a straightforward way to establish and maintain a suitable humidity target without continuously switching the dehumidifier on and off manually.

Remote Humidity Sensor

The main advantage of the DEH 3000R over the standard DEH 3000 is its remote sensor.

The sensor can be positioned in a central location where it can accurately monitor the humidity within the controlled area, while the main controller is installed in a convenient location for adjustment and monitoring.

This is particularly useful where the dehumidifier or control panel is installed overhead, remotely or in a position that does not accurately represent room conditions.

Remote Sensor Positioning

For accurate readings, install the sensor in a representative area of the room rather than directly beside:

  • Dehumidifier discharge air
  • Air-conditioning outlets
  • Ventilation supply points
  • External doors or windows
  • Localised sources of heat or moisture

Correct sensor positioning helps ensure the controller responds to overall room conditions rather than a localised pocket of unusually wet or dry air.

Programmable Ventilation Control

The DEH 3000R also provides control for compatible fresh-air ventilation systems.

A programmable ventilation timer allows the user to manage ventilation periods alongside dehumidification, helping combine humidity management and air exchange within one control system.

Ventilation functionality depends on the way the controller and associated equipment are installed and wired.

Fan & Air Handler Integration

The controller includes outputs for compatible fan and air-handler integration.

This allows the DEH 3000R to coordinate fan operation with humidity control and ventilation requirements, helping create a more integrated environmental-control system.

A/C Sensor Integration

When configured correctly, the controller can interact with an air-conditioning system through its sensor input.

This allows the dehumidifier to be activated or prevented from operating according to the wider climate-control arrangement, helping avoid unnecessary conflict between connected environmental equipment.

High-Temperature Cut-Out

The DEH 3000R includes a high-temperature cut-out function.

This allows the control system to prevent dehumidification under unsuitable high-temperature conditions when configured according to the installation instructions.

Dry-Out Cycle Timer

A built-in dry-out cycle timer provides additional control where a timed dehumidification period is required.

This can be useful in drying rooms and other applications where humidity needs to be reduced according to a controlled schedule.

Automatic Restart

The DEH 3000R features an auto reboot function, allowing the controller to recover automatically following an interruption to the electrical supply.

This is particularly useful in unattended commercial applications where environmental-control equipment is expected to resume operation without manual intervention.

Compatible Quest Dehumidifiers

The DEH 3000R is compatible with a wide range of Quest equipment, including:

  • Quest 70
  • Quest 70 50Hz
  • Quest 155
  • Quest 155 50Hz
  • Quest 200 50Hz
  • Quest 205
  • Quest 225
  • Quest 335
  • Quest 375 50Hz
  • Quest 506
  • Quest 506 277V
  • Quest 706 50Hz
  • Quest 746
  • Quest 876
  • Selected Quest Dual models
  • Quest 185 Cool

Important: Quest has produced multiple generations and electrical versions of some models. Always confirm the part or model number on your dehumidifier before ordering the controller.

Quest DEH 3000R Technical Specifications

Specification Details
Brand Quest
Model DEH 3000R
Part Number 4028531
Product Type Digital Dehumidifier & Ventilation Controller
Sensor Type Remote Humidity Sensor
Operating Voltage 24VAC
Maximum Current – Damper 1A
Maximum Current – Compressor 1A
Maximum Current – Fan 1A
Humidity Sensing Range 10–95% RH
Humidity Control Range 35–70% RH
Humidity Accuracy ±5% RH
Auxiliary Relay Capacity 5A at 24VAC
Temperature Range 30–90°F / Approx. -1 to 32°C
Dimensions Approx. 4.95" × 4.19" × 1.06"

Professional Installation

The DEH 3000R is a low-voltage HVAC control and should be installed by a suitably competent person familiar with Quest dehumidifiers and environmental-control wiring.

Correct installation is important to ensure the remote sensor, dehumidifier, fan and any ventilation equipment operate as intended.

Follow the Quest DEH 3000R wiring diagrams and installation manual for the specific dehumidifier being connected.

Installation Considerations

  • Mount the main controller on a suitable flat surface.
  • Position the remote sensor in a representative area of the room.
  • Avoid mounting the sensor directly beside supply or exhaust airflow.
  • Use the correct low-voltage wiring for the installation.
  • Confirm compatibility with the specific Quest model before connecting.
  • Follow all applicable electrical and installation regulations.

What's Included?

1 × Quest DEH 3000R Digital Control with Remote Sensor.

Dehumidifier, external ventilation equipment and additional installation wiring are not included unless specifically stated.

Quest DEH 3000R – Centralised Environmental Control

The Quest DEH 3000R provides a comprehensive way to control compatible Quest dehumidifiers while also integrating humidity monitoring, ventilation, fan control and advanced system functions.

With its remote sensor, digital humidity setpoint, programmable ventilation timer, high-temperature cut-out and auto reboot, it is an ideal upgrade for professional growing environments and other commercial spaces requiring reliable humidity management.