Skip to content
Save 10% On ProWarm!

Save 10% off our entire ProWarm underfloor heating range with code: PW10

Days
Hours
Minutes
Seconds
UK's #1 Underfloor Heating Company - Over 300,000+ Systems Sold!
Fast & Reliable Delivery
Fast & Reliable Delivery
Get a Quote
We'll Beat Any Price
Lifetime Warranty
Lifetime Warranty

Neptune In-Direct Unvented Hot Water Storage Cylinder

From
Was
£959.99
From £959.99
Now £959.99
In stock, ready to be shipped
NIND90L
In stock, ready to be shipped
NIND125L
In stock, ready to be shipped
NIND150L
In stock, ready to be shipped
NIND180L
In stock, ready to be shipped
NIND210L
In stock, ready to be shipped
NIND250L
In stock, ready to be shipped
NIND300L
Neptune In-Direct Unvented Hot Water Storage Cylinder
From
Was
£959.99
From £959.99
Now £959.99
Contact us

Need advice or a better price?

Help, advice or want us to beat a price? Call us on 01268 567016

Indirect Cylinder - Heated via an external heat source such as a boiler. Also includes an electric immersion heater.

Unvented Cylinder - Pressurised unit, fed directly from mains water. No header tank required.

The Neptune Cylinder is an unvented hot water storage system which is an ideal complement to the Fusion and SlimJim Electric Boiler range. Like all our products, the Neptune Range is manufactured to the highest standard and offers a high performance to suit your needs.

The Neptune range provides fast flow rates, energy efficient insulation, quick recovery coils, and the use of an external expansion vessel to reduce maintenance. Additionally the 3 bar operation of the unit meets all modern criteria for fast flow applications. The Neptune Indirect cylinder is suitable for providing hot water with all types of boilers: gas, electric, oil, solid fuel and LPG.

  • Suitable for use with an unvented system boiler
  • Suitable for use with an unvented system boiler
  • 3kW Electric Immersion Heater included
  • 550mm width
  • External Expansion Vessel
  • 120L - 300L capacity available
Our reviews speak for themselves!

Let our experts help you

Product Question? Need help placing an order?

Our customer support is available Monday to Friday 7am-6pm.

Call us on 01268 567 016
Email sales@theunderfloorheatingstore.com

Reach out to our expert team
Free delivery on all orders

At The Underfloor Heating Store, we strive to make every step of your order as easy and convenient as possible, from finding the right underfloor heating setup to best suit you to taking delivery of your system the very next day.

We're proud to offer free delivery on all of our orders.

Your delivery option for this product is 5-10 working days.

Explore our full delivery policy

30 days returns policy

At The Underfloor Heating Store, our customers have 30 days to upgrade, replace or refund their orders.

Returns

At The Underfloor Heating Store, we want to ensure you are happy with every purchase you make. If you have any issues with your chosen product, whether damaged, faulty or simply an unwanted item, you can simply return what you bought for a refund. Learn more.

Replacements

We take great care in the delivery of all of our products, however, in the event of your delivery arriving damaged or if you notice a manufacturing fault of any kind within 48 hours of delivery, you're within your rights to a replacement. Learn more.

Upgrades

Within 14 days of purchasing from us, you are eligible to upgrade if you deem you want something a little better. Simply send it back to us brand new and we'll happily assist you with an upgrade to your order. Learn more.

Lifetime warranty

At The Underfloor Heating Store, we are committed to providing our customers with high-quality products and outstanding customer service. That's why we offer a comprehensive warranty on all of our underfloor heating products, with a lifetime warranty for our ProWarm range of products.

Our warranties are designed to give you peace of mind and ensure that your underfloor heating system operates reliably for years to come.

Find out more

We'll beat any price

At The Underfloor Heating Store, our main priority is customer satisfaction. To cement our commitment to this, we are proud to offer our Underfloor Heating Price Match Promise. If you find a lower price on an identical product anywhere else, we will match it – guaranteed!

Discover our promise

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare