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NEWA Therm Next Water Heaters

£29.95

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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.

NEWA Therm Next Water Heaters – Submersible Hydroponic Nutrient Tank Heaters 50W–300W

The NEWA Therm Next Water Heaters are premium, fully submersible heaters designed to maintain stable water temperatures in hydroponic nutrient reservoirs, Deep Water Culture (DWC) systems, aquariums and other water-based growing applications.

Designed and manufactured in Italy, the NEWA Therm Next (NTX) range combines a high-precision electronic thermostat, compact construction and advanced heating technology to provide dependable temperature control. Each heater features a convenient top-mounted temperature adjustment dial and a two-colour LED indicator, making it easy to monitor heating operation.

Available in 50W, 100W, 150W, 200W and 300W models, these efficient reservoir heaters offer a practical solution for preventing nutrient solutions from becoming excessively cold during winter or in cooler indoor growing environments.

Key Features

Premium NEWA Therm Next submersible water heaters
Five sizes available: 50W, 100W, 150W, 200W and 300W
High-precision electronic thermostat for accurate temperature regulation
Fully submersible design for suitable water reservoirs and aquariums
Two-colour LED indicator displays heating status
Red LED indicates the heater is actively heating
Green LED indicates the selected temperature has been reached
Easy temperature adjustment using the top-mounted control dial
High-efficiency heating element for effective water heating
Magnesium oxide insulation helps distribute heat evenly
Compact construction compared with many conventional heaters
Durable glass tube with mechanical and thermal protection
Integrated thermal protection for safer operation
Includes suction cups and mounting supports
Suitable for hydroponic nutrient reservoirs, DWC and RDWC systems
Designed and manufactured in Italy
Three-year manufacturer's warranty

Available NEWA Therm Next Heater Sizes

The NEWA Therm Next range is available in five wattages, allowing you to choose a suitable heater for your reservoir volume and environmental conditions.

Model	Power	Indicative Water Volume
NTX50	50W	20–80 Litres
NTX100	100W	100–150 Litres
NTX150	150W	150–200 Litres
NTX200	200W	150–200 Litres
NTX300	300W	200–300 Litres

Please Note: The reservoir sizes above are indicative guides. Actual heater requirements depend on water volume, ambient temperature, reservoir insulation and the difference between the current and desired water temperature.

NEWA Therm Next 50W – NTX50

The NEWA Therm Next 50W is a compact, energy-efficient heater designed for smaller hydroponic nutrient reservoirs, propagation tanks and aquariums.

Its 50-watt heating element and electronic thermostat provide controlled warming for smaller water volumes, making it a useful option for compact DWC systems and individual nutrient tanks.

Model: NTX50
Heating Power: 50W
Indicative Reservoir Volume: 20–80 Litres
High-Precision Electronic Thermostat
Two-Colour LED Operation Indicator
Fully Submersible Construction

NEWA Therm Next 100W – NTX100

The NEWA Therm Next 100W offers increased heating capacity for small to medium-sized hydroponic reservoirs and water tanks.

Featuring a 100-watt heating element and automatic temperature regulation, it helps maintain consistent nutrient solution temperatures when the surrounding environment becomes colder.

Model: NTX100
Heating Power: 100W
Indicative Reservoir Volume: 100–150 Litres
Electronic Temperature Control
Compact Fully Submersible Design
Suitable for Hydroponic Reservoir Heating

NEWA Therm Next 150W – NTX150

The NEWA Therm Next 150W provides additional heating capacity for medium-sized nutrient reservoirs and recirculating hydroponic systems.

Its electronic thermostat and efficient heating element help maintain stable water temperatures, making it particularly useful during colder periods when nutrient tanks may lose heat overnight.

Model: NTX150
Heating Power: 150W
Indicative Reservoir Volume: 150–200 Litres
High-Efficiency Heating Element
Adjustable Temperature Setting
Suitable for DWC and RDWC Systems

NEWA Therm Next 200W – NTX200

The NEWA Therm Next 200W is designed for medium to larger water reservoirs requiring dependable heating performance.

Its 200-watt heating element works with the integrated electronic thermostat to maintain the selected temperature, while the LED indicator provides a convenient visual indication of heating operation.

Model: NTX200
Heating Power: 200W
Indicative Reservoir Volume: 150–200 Litres
High-Precision Electronic Thermostat
Red and Green LED Status Indicator
Ideal for Larger Nutrient Reservoirs

NEWA Therm Next 300W – NTX300

The NEWA Therm Next 300W is the highest-powered heater available in this range, providing increased heating capacity for larger hydroponic nutrient reservoirs and aquarium installations.

Its 300-watt heating element and precision thermostat make it a practical choice for water tanks requiring greater heat input to maintain stable temperatures.

Model: NTX300
Heating Power: 300W
Indicative Reservoir Volume: 200–300 Litres
Electronic Thermostat
Compact High-Efficiency Heating System
Ideal for Larger Hydroponic Reservoirs

High-Precision Electronic Temperature Control

The NEWA Therm Next range features a high-precision electronic thermostat designed to regulate water temperature automatically.

Once the desired temperature has been selected, the thermostat controls the heating element to help maintain consistent conditions within the reservoir.

This makes the heaters particularly useful in hydroponic systems where temperature stability is important for healthy root development and efficient nutrient uptake.

Two-Colour LED Heating Indicator

Each NEWA Therm Next heater features a convenient two-colour LED indicator, allowing you to monitor its operating status at a glance.

Red LED: The heating element is actively warming the water.
Green LED: The selected water temperature has been reached.

This simple visual indicator makes it easier to check whether the heater is operating without removing it from the reservoir.

Easy Temperature Adjustment

The NEWA Therm Next features an easy-access temperature adjustment dial positioned on the upper cap.

This allows users to select their preferred water temperature without complicated programming or external controllers.

For accurate monitoring, use a separate water thermometer to verify the actual reservoir temperature.

Maintain Stable Hydroponic Nutrient Temperatures

Maintaining the correct water temperature is an important part of hydroponic growing. Nutrient solutions that become excessively cold can reduce root activity and slow nutrient uptake.

The NEWA Therm Next Water Heater helps maintain stable reservoir temperatures by automatically supplying heat when required.

Consistent water temperatures can help:

Support healthy root development
Maintain favourable conditions for nutrient uptake
Reduce temperature fluctuations between day and night
Prevent nutrient reservoirs becoming excessively cold
Support more stable growing conditions during winter

For many hydroponic crops, a nutrient solution temperature of approximately 18–21°C is a useful starting point, although the ideal temperature depends on the plant species and growing conditions.

Ideal for DWC & RDWC Hydroponics

In Deep Water Culture (DWC) and Recirculating Deep Water Culture (RDWC) systems, plant roots remain in direct contact with the nutrient solution.

Maintaining stable water temperatures is therefore particularly important, especially in colder growing environments.

NEWA Therm Next Heaters can be installed in compatible nutrient reservoirs to help prevent excessive cooling and support a more consistent root-zone environment.

For best results, position the heater where water circulates freely to help distribute warmth throughout the reservoir.

Compact Design with Efficient Heat Distribution

The NEWA Therm Next range uses high-efficiency heating elements and magnesium oxide insulation to provide effective, even heat distribution.

This advanced construction allows the heaters to remain relatively compact compared with many conventional water heaters of equivalent wattage.

The smaller design makes installation easier in reservoirs where space is limited.

Durable Glass Tube & Mechanical Protection

NEWA Therm Next Heaters are manufactured using high-quality materials designed to withstand the mechanical and thermal demands of submerged operation.

The glass heating tube provides effective heat transfer, while the protective construction helps reduce the risk of damage during normal use.

Integrated thermal protection provides an additional layer of safety.

Important: Always inspect the heater before installation and never use a unit with damaged glass, a damaged cable or other visible defects.

Fully Submersible Reservoir Heater

The NEWA Therm Next is designed for fully submerged operation in suitable water reservoirs and aquariums.

Supplied mounting clips and suction cups allow the heater to be secured inside the reservoir, helping maintain a stable position during use.

Position the heater according to the manufacturer's instructions, ensuring that it remains adequately submerged and that water can circulate around the heating element.

Made in Italy – Premium NEWA Quality

Designed and manufactured in Italy, the NEWA Therm Next range combines reliable engineering, precision electronic temperature control and durable materials.

Each heater is supplied with a three-year manufacturer's warranty, providing additional confidence in the quality and durability of the product.

Ideal Applications

Hydroponic nutrient reservoir heating
Deep Water Culture (DWC) systems
Recirculating Deep Water Culture (RDWC)
Hydroponic propagation reservoirs
Recirculating hydroponic growing systems
Nutrient tank temperature management
Freshwater aquariums
Marine aquariums where compatible
Aquaponic systems where suitable
Indoor water tanks
Winter reservoir heating

Product Specifications

Brand	NEWA
Product Range	Therm Next (NTX)
Heater Type	Electronic Submersible Water Heater
Available Models	NTX50, NTX100, NTX150, NTX200, NTX300
Power Options	50W, 100W, 150W, 200W, 300W
Temperature Control	High-Precision Electronic Thermostat
Temperature Adjustment	Top-Mounted Dial
Status Indicator	Two-Colour LED (Red / Green)
Construction	High-Strength Glass Tube with Protective Housing
Heating Technology	High-Efficiency Element with Magnesium Oxide Insulation
Installation	Fully Submersible
Mounting	Suction Cups and Support Clips
Safety Features	Thermal and Mechanical Protection
Warranty	3 Years
Country of Manufacture	Italy
Applications	Hydroponics, DWC, RDWC, Aquariums and Reservoir Heating

How to Choose the Right NEWA Therm Next Heater

When selecting a NEWA Therm Next Heater, consider the following factors:

Reservoir Capacity: Larger volumes of water generally require higher heating power.
Ambient Temperature: Colder environments increase the amount of heat required.
Desired Water Temperature: Consider the difference between the current water temperature and your target temperature.
Reservoir Insulation: Insulated reservoirs retain heat more effectively.
Water Circulation: Good circulation helps distribute heat evenly throughout the tank.
Installation Space: Ensure the heater can be safely positioned without contacting sensitive equipment.

Top Tip: Using a small circulation pump alongside your reservoir heater can help distribute warmth more evenly and reduce localised temperature differences.

Installation & Maintenance Tips

Select the appropriate heater wattage for your reservoir and growing environment.
Inspect the heater for damage before installation.
Secure the heater inside the reservoir using the supplied mounting clips and suction cups.
Ensure the heater is correctly submerged according to the manufacturer's instructions.
Position it where water can circulate freely around the heating element.
Allow the heater to acclimatise to the water before switching it on, following the manufacturer's instructions.
Set the required temperature using the adjustment dial.
Use a separate thermometer to monitor the actual water temperature.
Disconnect the electrical supply before carrying out reservoir maintenance or water changes.
Allow the heater to cool before removing it from the water.

Safety Information: Never operate the heater outside water or allow it to run dry. Do not use a damaged heater. Follow the manufacturer's installation instructions and use an appropriate RCD-protected electrical supply.