Combisave Energy Saving Valve for Combination Boilers (COMBISAVE)
**Can be fitted to existing pipework in less than 30 mins**
CombiSave is a thermostatically operated valve set to become an essential add-on for new and existing combi boilers.
CombiSave conserves Water
- 55,000 litres per year, that's around £140.
CombiSave reduces Gas Bills
- By about £50 in gas annually, but can be in excess of £100
CombiSave saves Money
- Less water and gas are used after CombiSave is fitted
CombiSave provides Quicker Hot Water
- Some homes with a combination boiler wait over a minute for water to run hot from the tap; on average 21 hours of time person per year could be saved by not having to wait for hot water!
CombiSave reduces Carbon
- A saving of approximately 260Kg to 500Kg of Co2 per year per home.
*Figures based on Government backed, independent scientific tests by EA Technologies
A CombiSave is suitable for retro-fitting to any make of existing wall hung combi-boiler in less than 30 minutes and will not affect boiler warranty.
The device is small and "fit and forget", needing no power supply or maintenance.
Frequently asked questions (answered by the product inventor on UK's Plumbing Forum)
1 How does it work ?It slows the flow down to 2.5 litres if it is below set temperature of around 44-45 C (this can be adjusted to suit easily). This then causes the water in the boiler to warm up a lot faster and then the valve gently opens to give full unrestricted flow. Another plus to the CombiSave is that it maintains the outlet temperature so that in the winter on some boilers you won't then get a luke warm flow.
2. Can it really save that much gas or water?Savings will depend on the number of people in a home, their hot water usage and habits, hence vary enormously. At current gas prices the estimated savings for a family of four averages £66 but that is the average, on a couple of boilers the savings were around £150. The water savings are £180.
3. What about boilers with pre-heat?CombiSave can be retrofitted to most types and ages of combi boiler. Those that are fitted with an eco-button/pre-heat function are using gas while these are activated. The pre heat on boilers do not always keep it up to temperature as they heat the water up and let it cool down a bit and then boost it back up again. When the tap is turned on the boiler still takes a little time to fire up so most times the water will run warm, then you will feel the water get cooler and start to slowly warm up again. So the CombiSave will still assist by helping the boiler warm the water quicker. But if you turn the pre heat off you will save more money as it is not continually heating the water all the time
4. You can achieve the same thing by running hot taps slowly until they warm up?Yes, it does work on the same principle as turning the hot tap slightly until the water is hot. But it would be unlikely that everyone in the house (and their guests) could be trained to do this each time accurately. Also you can’t regulate the flow on some appliances such as washing machines and showers. Just as we buy remotes for TVs but we could do that manually too!
5. What about potential damage to the boiler?CombiSave imitates an "intelligent tap" so does not affect boiler mechanisms. The lifespan of a CombiSave is 10-20 years and the oldest one fitted to the rudimentary design has been in place problem-free for five years.
6. What effect will killing the flow until the water heats up have on the boiler?The initial flow will not be "a trickle", but is approx a third normal flow, so enough to rinse off something before full flow of hot comes through.
7. Won't it increase limescale formation within the boiler in hard water areas?No, there is no evidence of this. The components of CombiSave have been carefully chosen to be suitable for all areas.
8. Is it powered or mechanical?It is mechanical using no power and comes with a 3 year warranty.
9. What is the service time scale recommended ?There is no servicing required and the expected lifespan is around 20 years.
10. Where is it manufactured?The combisave is British built by a long established company who made valves and sensors for Rolls Royce engines for Spitfires, Lancasters etc and still produce for MOD, Rolls Royce and JCB.
User test results (posted on UK's Plumbing Forum)
Test before the install. At the kitchen tap just under 8l of water flowed into a bucket before the temp reached 40c, the same was recorded at the bath.
After fitting, we tested again and just under 4l of water flowed into the bucket and the water was noticeably hotter quicker getting to 45c.
The combisave had to be adjusted because the brittony se80 would not fire at 2.5l per min. and would have saved more water if it had.
Before it took around 10 litres to get 38 degrees, when it was fitted it took around 5 litres. The time was basically halved I cant remember the exact times but from i think 58 seconds before to around 30 after.
The flow rate is adjustable and so is the temperature, both by turning a screw on the valve.
Its very easy to fit and will adjust to any pipe configuration.
Any competent DIYer reading this considering it buy one, easy to fit yourself.
I'll be recommending it, already going to fit one at another house, it basically halves the water bill if on a meter, and obviously saves on gas at the same time. Some might think its a bit expensive at the minute but it will only take a year or so at the most to pay for its self and will last for 20+ years so cant loose
results are as follows...
pre combisave time taken to get hot water at 45 degrees from hot tap = 31 seconds
post combisave = 26 seconds
pre combisave volume of water wasted prior to 45 degree water delivery = 5 litres
post combisave = 2.5 litres
obviously my boiler was performing better than those in the above tests however, even though my water saving was less in terms of volume, when expressed as a % it is still 50% which is pretty impressive.
on water savings alone it will pay for itself in 18 months, but the 5 seconds less delivery time from boiler ignition to delivery ensures that additional savings will be made on gas also.
all in all i have to say i'm pretty impressed with the whole thing, it is easy and quick to install, solidly built quality valve from a manufacturer with a proven pedigree, and offers RESULTS.
i will definitely be recommending this product to my customers.