Evacuated tubes or PV-heating-converters?

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Schematics for evacuated solar tubes, installations and installers.

Evacuated solar tubes.


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Evacuated solar tubes and installations were popular with homes with water tanks

Evacuated solar tubes is a water heating system, developed for northern European countries to heat hot water tanks using passive solar energy.


In a nutshell.

Evacuated tubes, commonly known as solar tubes, are the most efficient of the more traditional flat-plate panels.

Installing this solar energy system will enhance your traditional heating system and bring it up to modern 'building regulation' standards too.


The science bit.

The evacuated tube system heat-up due to the sun's short-wave radiation output converting to long-wave radiation.


Specifications.

Temperature: 40-80° Celcius.
Pressure: 3 bar.


We recommend installing PV solar panels working alongside a heating converter to heat water.



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"There are an estimated 260,000 homes with evacuated solar tubes in the UK currently."


A different perspective

Solar heating as a principle can be used to decontaminate water in a plastic bottle to make it safer to drink.

Today, with the advantage of modern manufacturing, we can use this same principle to heat hot water tanks.

Evacuated tubes are super-efficient vacuums that retain passive heat from the sunshine that hits our roofs every day.

This system is ideal for northern European climates and so efficient that restrictions to temperatures of 85 degrees Celsius have to be applied.

Now, this is where it gets interesting. A solar tube system installed today will still be providing significant savings for the next three decades.

A significant factor in a system's performance figures is how well-insulated hot water tank is. Beware that not all companies upgrade the tank, and this omission will affect the year-round performance.

Homes with solar heating benefit from reduced boiler usage over a timespan of decades.



Questions about evacuated tubes

Roof orientation?

Most homes are suitable. If you have an S/SE/SW or east/west facing roof space, then great. Your internal plumbing needs to be checked for compatibility too.

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How much will a system cost?

The cost of an evacuated tube system depends on several factors. Your water tank size determines the number of tubes required though.

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The real benefits of evacuated tubes in the UK.

How do evacuted tubes work?


Do evacuated tubes work consistently in the UK climate?

Evacuated tubes are the most efficient solar heating technology, but not as useful as PV-heating converters.

The UK receives 60% of the sun's radiation compared with the equator. Each square metre of the UK receives between 900 to 1,300 kWh annually. All can be captured and diverted into your hot water tank with evacuated tubes.

Evacuated tubes use a thermos flask principle that allows each vacuum tube to get hot regardless of external air temperature.


What about Combi boilers?

Combi boilers aren't possible in most cases. We would need to re-install a hot water tank. Most homes with Combi's won't have the space to install a hot water tank.


Can I install evacuated tubes myself?

In most cases no. However, if you're Part P electrical accredited, then it may be possible to install in a DIY capacity.

All evacuated tube installations must be carried out and commissioned by an accredited MCS-installer only.


Is there a danger that it could get too hot?

The system may never rise above 85° Celcius.


Why update my hot water tank?

Older 'copper' hot water tanks run exceptionally inefficiently, especially after many years of use. Limescale will reduce performance even further.

When installing evacuated tubes, it's essential to establish a modern more efficient tank to get the most out of your system.


Will it contribute towards my central heating?

We would need to check your management system is suitable. In most cases, evacuated tubes can contribute to your central heating via underfloor heating.


How long will it take to install?

Only a few hours in most cases.


Do I require planning permission?

Listed buildings, conservation area homes, national parks may require permission. Please consult with your local planning officer.


Do evacuated tubes work on cloudy days?

This question depends on the density of the cloud. In average cloud density, solar panels use passive energy. With dense cloud cover, probably not.


Can you upgrade my hot-water tank?

Does your tank has an unused twin-coil? In most cases, we update the hot water tank to allow a secondary connection to the evacuated tube system.


How much CO2 will my system save?

Around half a tonne each year, but this is dependent on how much hot water gets used and how you heat the water at present.


How long do evacuated tubes last?

A system will easily last twenty-five years.

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