Rainwater Harvesting
McCallum water heating has been involved in the building services industry since 1878 and have had to adapt as the industry has changed over the years, in recent times the industry has been asked to look at building design and the impact it may have on the environment,
Rainwater harvesting systems are being incorporated in many educational, commercial and public sector projects. These systems can reduce mains water consumption, drainage bills and reduce the buildings carbon footprint.
McCallum water heating recognises the importance of working with specialist rainwater harvesting company and has been able to supply support in the design and installation on many projects to both consultants and installers. We will ensure the most cost-effective rainwater harvesting system is specified on each project and will continue to supply ongoing support once your system is installed.
Typical McCallum Freerain Systems
Header Tank System
Direct Pressure System
Tanks
Most commercial project will require an underground tank these would normally be constructed from GRP and start at 6000 litres, smaller tanks are offered and these would normally be made of high strength ribbed polyethylene.
Above ground tanks are also catered for, these are normally sectionally constructed and situated in the plant room area, we can also provide a sectional tank to store rainwater in the roof void area, with the system relying on gravity to provide the domestic system below.
Filters
In order to ensure the highest water quality is achieved and downstream reliability it is essential that the correct pre-tank filter(s) is integrated in to the rainwater harvesting system. In our range we can supply filters suitable for roof areas over 5000 M².
Above is a Twinfilter this can be installed in chambers underground, or directly on the wall where it can be kept frost free, Usually installed in standard 1000mm manholes. The filter could also be pre-installed in chambers prior to delivery to site.Through its 2 step cleaning process it has high efficiency independent of flow rates. Due to the steeply inclined filter insert, dirt is continually washed to the waste water outlet. The clean water passes into a small collecting sump, from where it is led to the storage tank.
Secondary filtration is often used depending on the roof material, with UV options also offered where it is necessary to filter the water to a potable quality.
Pumps & Controls
Each system is bespoke to the buildings requirements and the control panel and pumps can be not different. The Rainwater Harvesting System is designed to meet the Buildings demand and can also be supplied with a display panel showing its performance.
Typical Control Panel Typical Display Panel
(Direct Pressure System)
