The ‘Castle’ Whole House Unit – H2o18

£985.00 inc VAT

H2o18 “The Castle”, is available for exceptional cases where there is a need for regular, very high flow in the house. You’ll just need to check in with us and run it through your system before you purchase this one.

The H2o18 unit treats all of the water entering the property, ensuring all equipment within the home is protected. Please call us to order this unit – 0345 5040656.

  • 22mm (female BSP connectors) = 190mm length
  • Average flow rate – 18 lpm (Min. 12 lpm; Max 24 lpm)

P&P cost – £12*
Delivery Times – 3-5 working days*

SKU: 5070000418926 Category: Tag:

H2o18 “The Castle”, available for exceptional cases where there is a need for regular, very high flow in the house. You’ll just need to check in with us and run it through your system before you purchase this one.

Who is Halcyan Water Conditioner perfect for?

A Halcyan water conditioner is for anyone in a hard water area who wants to put an end to their limescale problem, especially if they want a solution that lasts over 30 years, is maintenance-free that whole time and has no negative effect on the environment. Halcyan is an especially good fit for:

  1. people who want to deal with limescale but don’t want to use salt softeners due to environmental concerns, space concerns, or just can’t be bothered with the monthly maintenance
  2. People who want an easy way to save money long-term on their energy bills
  3. Prudent homeowners, new builders, and renovators, protecting their investments
  4. Householders who want to protect their hot and cold-water systems, while extending their appliance’s lifespan
  5. people who want to live more sustainably and reduce their carbon footprint

 Is Halcyan Right for you?

  • If you want to save money on your energy bills (on average, you could save between £330 – £500 every year)
  • If you live in a hard water area and struggle with the effects of limescale on your appliances
  • If you’re short on space for a traditional salt-based system or simply don’t want to sacrifice a kitchen cupboard
  • If you want to deal with limescale sustainably without adding chemicals or salts to our rivers system
  • If you want to transition your home to be carbon neutral (save 0.6 tonnes CO2e per year)
  • If you want to be able to drink the water from every tap in your home
  • If you want a solution that is zero maintenance, lasts for over 30 years and that’s a total fit and forget solution
  • If you want to enjoy more skin, hair and people-friendly water

It is not right for you if:

  1. You want 100% soft water
  2. If you can’t bear to see even a light, non-bonding powder on your surfaces

How easy is this product to fit?

The Halcyan Water Conditioner is very straightforward to choose a suitable size using our intuitive quiz. Our water conditioners are also very easy to install. Assuming you have standard pipework, it should take a plumber between 30-60 mins to fit a Halcyan Conditioner.

If you are a DIY enthusiast, you may be able to fit it yourself without the need of a qualified plumber. We have created an easy-to-follow installation guide and video here.


What are the benefits of this product? 

Money-saving – Saves money on energy and additional household bills (£330-500 pa on energy plus around £500 per annum on cleaning products)

Easier cleaning – Limescale is removed and new deposits are treated so they only form an easy-to-clean powder residue

Money and time saving – Reduces maintenance for boilers, and kitchen and bathroom fixtures and fittings, extending the lifespan of appliances

Health – Water is safe and contains all the healthy minerals nature provides.


All Halcyan Water Conditioners are a one-off purchase and installation meaning a permanent fit with zero maintenance for over 30 years. Each comes as standard with a comprehensive 30-year warranty and a 12-month performance guarantee. Every product fits a compact design and standard fittings, for easy installation and is simple to install requiring no earthing, no power and no directional flow requirements. Our water conditioners are a sustainable solution adding no salts or chemicals to the water system, meaning our customers usually feel softer skin, hair and products like soaps and shampoo lathers more effectively.


What makes Halcyan products different when they look the same?

Whilst Halcyan superficially resembles many systems on the market we differ in several key ways. The effectiveness of the unit at removing and preventing limescale build-up, the length of the effect on the minerals (2-3 weeks rather than 48 hours), the lifespan of the system (30 years), and the additional ‘softer’ water benefits.

For a more thorough look into the differences between hard water, treatments check out our blog.


Delivery and return options

We dispatch on Tuesdays and Thursdays with next-day recorded delivery, so you will always receive your Halcyan on either Wednesday or Friday of the same week. We can make special delivery arrangements if your need is more urgent, simply contact us to discuss options.

Returns – if the unit is returned undamaged, without having been fitted and in the same condition it was despatched, within 14 days of purchase, then you are eligible for a full refund.