Optimmersion®
Free hot water from your Solar PV system

Automatic free hot water
Use surplus power from your renewable system to heat water in your existing immersion tank.
Start saving money
The intelligent immersion controller starts diverting power with as little as 50 Watts excess saving an extra 15p – 45p per day more than competitors.
Smart use of your power
Optimmersion® works with Wattson Solar Plus, Wattson Anywhere and Optiplug to identify and use your free electricity even after water is heated.

introduction

It can be hard to find ways to make the most of your home-grown electricity consumption. Optimmersion® is an automatic controller that diverts your surplus generated electricity to heat water in your immersion tank. Investing in an Optimmersion® system for use with solar panels will pay for itself in as little as 2 ½ years, and will bring you savings on your energy bills year after year.

For those with a 3.68kW PV system, allowing Optimmersion® to divert surplus generation means water is heated during sunlight hours; this minimises the cost of energy used to heat your water, or even make it totally free.

The Optimmersion® is the most responsive and efficient system on the market, ensuring that never import power during operation and use as much of your generated power as possible.

Once the cost of system has been paid back, you will see years of profit ahead of you in the form of lower energy bills. The Optismart bonus refers to additional savings made simply by being aware of and controlling your home’s electricity consumption, using the Wattson energy monitor.

What people are saying about Optimmersion®

“Anything that can take the edge off gas usage is a good idea. It’s amazing how Optimmersion Wireless with a 4kw PV system can heat a DHW cylinder by lunchtime, even in winter on a really good day”

Chris Cowap, Sustainable Energy Engineer, ZLC Energy

“I knew the system would be efficient when I chose to install it, but I never guessed how fantastic it would be in terms of saving energy and money”

Steve Davies, Newport

“Today, Tuesday 8th April 2014, I didn’t have the boiler fire on at all during the day and I had loads of hot water! Following an injury whilst serving in the Fire Brigade, I like to ease my aches and pains in a deep hot bath, this is going to be great and I get to lower my gas bill too– thank you so much Optimmersion Wireless.”

Stephen Wareing, Weston Super Mare

“Since we installed our Optimmersion® we can’t believe how much we have already saved! In November alone we saved £20 in oil bills because we used our own generated surplus electricity to heat our water tank. We were able to check the figures using our Wattson.”

Jill & Tony, Cambridgeshire

Product information

Optimmersion is a proportional controller that diverts surplus electricity to heat water in the immersion tank. It only uses surplus electricity – electricity that is not being used in the house, so it is effectively giving you free hot water.

You get free hot water from your generation because only the surplus power from your renewable system is used to heat the water in your tank.

The intelligent controller gets to work whether or not you’re in the house, meaning you automatically get hot water with electricity you would otherwise be exporting.

You are being Smart about electricity because you are only using surplus. All of your ‘home-grown’ electricity is put to use, minimising what you pay your electricity supplier.

You will see your water heating bills drastically reduce as excess electricity is diverted to the immersion heater.

Optimmersion® is a standalone system that does not require a Wattson Solar Plus to get its data.

If you are already a Wattson owner, it will work very well to show how much of your generated electricity you are using and how much power you could be using on other products in the home.

If you don’t already have a Wattson, we recommend starting with Optismart Hot Water which includes a Wattson display, showing you how much energy is being diverted to your tank.

Optimmersion® should be installed by a professional electrician, installer or equivalent. It has a auto-calibration meaning the installation is quicker than ever.

The Optimmersion® system ensuring all of this household’s generated electricity is used in the house with the surplus diverted to the immersion tank

You can follow the use of power in your system using Wattson Anywhere which can be viewed from any browser based computer, tablet or smart phone.

Optimmersion® versions

All versions are supplied with a controller unit and a power throttle, part of the modular design. The controller unit needs to be accessible as not only does it become your controller, but it shows useful information about the performance of your system.

Optimmersion® OIMM-NLEN-UK

Optimmersion® makes use of surplus generated electricity to give free hot water. It diverts power to the immersion heater proportionally, starting at a surplus of just 50W – much lower than the 200W+ required by its competitors, making it much more effective during the winter when needed most.

It now has a large 5” touch-screen display showing Generation, Usage, Import/Export and Diverted Power. A 1hr boost can be set with a single touch. Multiple timers for use with off-peak tariffs and to ensure water is hot when required can also be turned on/off with a single touch.

Optimmersion® has a Wattson transmitter built-in, giving wireless connectivity between the Controller and the Power Throttle so there’s no need to do any re-wiring if other things are wired onto the immersion heater spur – installs are standardised, repeatable and fast.

Optimmersion® is now simpler to install as it self-calibrates – the sensor clips can be placed in any orientation around the cables. It also calculates the size of the attached load to display accurate diverted power data automatically and displays historical data.

Optimmersion® can send accurate data to all other Energeno products, including Wattson, Optiplugs and the new Optismart Gateway for real-time online data, offering a complete solution to make the best use of surplus generation in a home – it can do much more than just heat water.

Why choose Optimmersion®?

Wireless link gives standardised, repeatable & fast installation
5” touch-screen colour display shows generation, usage, import/export and diverted power
Mains powered, giving fast reactions to changing conditions so starts at just 50W surplus – no need for a large 200W+ surplus and no batteries to change
1hr boost plus multiple timers allowing for use of off-peak periods
Wattson technology built-in means it can be used with a Wattson display, Optismart Gateway and/or Optiplug
Can cater for multiple tanks in either shared or cascaded formats
Up to 4 additional Power Throttles (available separately) can be controlled with one controller unit, each diverts up to 3kW giving max. 15kW of resistive load per phase
Suitable for gas or oil fired boilers with electric heating elements
Can be used with wet or dry heating systems
Only the small controller fitted at the MCU, perfect for when space is limited
Can log data directly when SD card inserted
Made in Britain
3 year Warranty
Electromagnetic certification EMC EN61000-3-3

Optimmersion® has replaced the Optimmersion® Wireless OIMM-WIEN-UK in the new-look Optimmersion range.

Optismart® Hot Water OSHW-NLEN-UK

Optismart Hot Water comprises an Optimmersion® and a Wattson Solar Plus display in one cost effective solution that is cheaper and quicker to install than buying them separately. The dedicated Wattson display included has an additional mode showing diverted power.

The transmitter in the Optimmersion can also send data to the Wattson Anywhere portal via the Optismart Gateway and can control Optiplugs to make best use of generation with other appliances.

Wattson Solar Plus is an energy monitor that makes it very easy for everyone to see when they are generating more power than they are using by glowing green and shows how much more power they could be using for free in big bright numbers. When they are importing a small amount of power from the grid it glows blue and gets redder and redder the more they are buying in. It also shows them the cost of the power they buy so they can make better informed decisions about usage to bring their bills down.

Why choose Optismart® Hot Water:

Wireless link gives standardised, repeatable & fast installation
Mains powered, giving fast reactions to changing conditions so starts at just 50W surplus – no need for a large 200W+ surplus and no batteries to change
1hr boost plus multiple timers allowing for use of off-peak periods
Colour display shows generation, usage, import/export and diverted power
Wattson technology built-in means it can be used with a Wattson display, Optismart Gateway and/or Optiplug
Can cater for multiple tanks in either shared or cascaded formats
Up to 4 additional Power Throttles (available separately) can be controlled with one controller unit, each diverts up to 3kW giving max. 15kW of resistive load per phase.
Suitable for gas or oil fired boilers with electric heating elements
Can be used with wet or dry heating systems
Only the small controller fitted at the MCU, perfect for when space is limited
Can log data directly when SD card inserted
Made in Britain
3 year Warranty
Electromagnetic certification EMC EN61000-3-3

Optismart® Hot Water has replaced the Optismart® Hot Water OSHW-WIEN-UK in the new-look Optimmersion range.

Optimmersion® Classic OIMM-CLEN-UK

Optimmersion® Classic is the entry-level model in the Optimmersion range of intelligent immersion controllers that give free hot water from surplus renewable electricity. It proportionally diverts surplus electricity to the immersion heater, stating at a surplus of just 50W, much lower than the 200W+ required by its competitors, making it much more effective during the winter when needed most.

Optimmersion® Classic has a 1hr boost plus multiple timers allowing for use of off-peak tariffs and to ensure water is hot when required. The colour display shows how much electricity is being generated, used and how much surplus is being diverted to the tank. Optimmersion® Classic can cater for multiple tanks in either a shared or cascaded formats.

Optimmersion® Classic has two main components, a Power Throttle and Controller. These need to be hard-wired together, and both are installed near the consumer unit as the controller needs to attach its 2 sensors to single core wires from the inverter and from the grid, both of which can easily be accessed here. Optimmersion® Classic is suitable for immersion heaters on dedicated circuits to be certain no re-wiring is required; the alternative Optimmersion® Wireless links the Controller and the Power Throttle wirelessly for easy install when the immersion heater is not on a dedicated circuit.

Why choose to sell Optimmersion® Classic?

Mains powered, giving fast reactions to changing conditions so starts at just 50W surplus – no need for a large 200W+ surplus and no batteries to change.
Colour display shows generation, usage, import/export and diverted power
Multiple timers allowing for use of off-peak periods plus 1hr boost.
Can cater for multiple tanks in either shared or cascaded formats.
Up to 4 additional Power Throttles (available separately) can be controlled with one controller unit, each diverts up to 3kW giving max. 15kW of resistive load per phase
Made in Britain
3 year Warranty
Electromagnetic certification EMC EN61000-3-3

Optimmersion® Classic has replaced the Optimmersion® Simple OIMM-BAEN-UK in the new-look Optimmersion range.

How it works

Optimmersion® is a proportional controller to add to a Solar Power installation. It diverts free electricity to the immersion heater when surplus power is available.

Simple to install, it supplies variable power depending on the excess electricity being generated. It automatically harvests surplus electricity and all of it is used to heat water and maintain temperature level.

It is installed between the immersion tank element and the mains, no modification to the existing immersion element, hot water cylinder or pipework needed.

Optimmersion® uses both directional current transformers and voltage sensors to constantly measure the power being generated by Solar PV and also power in use in the home. The clever Optimmersion® system regularly calculates the excess electricity which varies the power to the heating element. The advanced electronics provides a true variable output.

Downloads

Optimmersion® Product Brochure

For technical specifications and installation information such as multiple immersion tanks and three phase environments, please visit our Support section.

More info

The bright and attractive colour display also shows you at a glance what you are saving and what you are using.
Shows daily total of energy saved
Suitable for installation at the same time as the Solar PV system or afterwards
Uses existing immersion heater
Can control power to any resistive load up to 3kW
Simple power monitoring using AC current clamp
Automatic low cost electricity boost setting (eg. Economy 7)
Manual booster control
UK manufactured
3 year product warranty
Part of the Wattson eco-system
Standalone product for non-Wattson users
Can divert energy to more than one heating element
Enhanced flexibility with a choice of four product versions to suit your home’s wiring set up.