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Solasyphon solar water heater


The Willis Solasyphon is much more environmentally friendly than conventional twin coil solar cylinder technology due to the fact that the Syphon is fitted to the existing water heating system, therefore reducing the carbon footprint created by installing a new solar cylinder.

Delivers solar heated water in minutes

 The unique and innovative feature of the Willis Solasyphon is the way in which it delivers solar heated water directly to the top of the existing water hot water cylinder where it stratifies ready for use at a useable temperature.

Produces hot water even in marginal conditions
In marginal or intermittent conditions such as are common in the northern hemisphere, particularly in Autumn, Winter and Spring the Willis Solasyphon will produce useable hot water in a way no other renewable energy system can at present. One hours sunshine will produce one hours worth of hot water at a useable temperature.

No replacement cylinder required
The Willis Solasyphon can be connected to the existing hot water cylinder with two simple connections. This is quicker, cheaper and much more environmentally friendly than the alternative.

Easy Installation
Fitting a Willis Solasyphon to an existing system is quick and easy to install and minimises any possibility of upsetting the existing plumbing system that can occur when you are replacing the existing cylinder with a new solar cylinder. Retrofitting a renewable energy system has never been easier.

Installation Instructions

Consumer Information

Legal Information and specification

Academic assessment

Vented systems

Pressurised System


Explanatory Video -Watch it work and see why you need to buy this! 

This item carries a 25 Year Warranty


Priced at 249 including delivery to UK & Ireland.

Price includes VAT and a VAT receipt is available.

Delivery charge covers all UK and is 19

Item Name: Solasyphon
Item Number:
Total Price: 249 (Price Includes UK & Ireland delivery)

Delivery outside the UK can be quoted on request.

All prices are exclusive of VAT unless otherwise stated


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Last modified: August 21, 2018    Order Form

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