The answer is straightforward and unambiguous: If you have a combi boiler system, you don’t need — in fact, you can’t use — a Megaflo system. That’s because combi boiler systems don’t work with hot water storage cylinders — they are designed to supply hot water instantly, on demand.
What is the difference between a MEGAFLO and a combi boiler?
The main difference in cost between choosing a Megaflo boiler and a combi boiler system is that combi boilers don’t need a cylinder therefore making the project slightly cheaper. Here, we have listed the benefits of installing a Megaflo boiler system in your household:
How much does an unvented Megaflo boiler cost?
Unvented hot water cylinder installation costs can be anywhere between £500 to £2,000 depending on the work what is needed to be carried out for the boiler installation What is an Unvented Megaflo boiler system? A Megaflo system, which is commonly misspelt or heard as a ‘Megaflow system’ is a hot water cylinder made of stainless steel.
How do Megaflo boilers heat up cold water?
Megaflo boilers heat up the cold water either directly or indirectly (as previously mentioned) at a quick speed and then they store it in their unvented cylinder. Megaflo boilers can do this because of their in-built expansion vessel.
Do I need a Megaflo tank?
A Megaflo is not a replacement boiler. A Megaflo hot water cylinder is to be used alongside a system boiler. A Megaflo tank would be needed if: If you often run up to 3 baths and a shower at once. If you have over a 16 litres per minute flow rate. High water pressure is demanded. If you have the spare storage space to fit the cylinder.
What sinks will be well served by the combi?
How does a boiler work?
Is a combi boiler the same as a central heating boiler?
Can you fit an unvented H/W cylinder to a combi boiler?
See 1 more
About this website
Can you install a Megaflow with a combi boiler?
You (or should I say a qualified person) can fit an unvented H/W cylinder to a combi boiler. It can be done in exactly the same way as a conventional system.
Do combi boilers need Megaflow?
As you will have seen, it largely depends on the number of bathrooms you have and whether you have gas supply. If your property is 3 bed or under, then consider the Combi boiler. If you have more than 3 bedrooms and more than 1 bathroom plus you have the storage space, then a Mega Flow will be a good option.
What type of boiler do I need with a Megaflo?
system boilerA Megaflo hot water cylinder is to be used alongside a system boiler. If you are considering getting a new system boiler, ensure that you check that it is a hyrdogen ready boiler so that it avoids the gas boiler ban in 2025. A Megaflo tank would be needed if: If you often run up to 3 baths and a shower at once.
Can a combi boiler be used with an unvented cylinder?
The answer is, yes. Just add a hot water storage cylinder to the combi boiler system. You need a lot of energy to heat water as it flows through a heat exchanger, so they are rarely undersized.
Does a Megaflo increase water pressure?
Moreover, being an unvented system, the Megaflow mimics the pressure of the water mains, thus helping households get a steady stream of hot water, anywhere within your home. This means you wouldn't have to worry about poor water pressure even when there is more than one outlet (shower or tap) running!
Which is better combi or unvented?
Combi boilers are often seen as a heating and hot water cure all, providing more or less instantaneous hot water without the need for a storage and expansion system. However, when specifying for housing where faster flow rates are required, an unvented hot water cylinder may be a more appropriate choice.
How much does it cost to install Megaflow?
Prices last updated in January 2021. When it comes to the cost of installing an unvented hot water cylinder, you should expect to pay somewhere between £500 and £1,500 – it all depends on how much work needs doing.
Is combi boiler good for large house?
The truth is that even the smallest combi boilers will heat most larger homes and the best solution for you might not be a combi at all. The real driver for selecting the right boiler for a larger home is your hot water requirements. If you need lots of hot water, a hot water cylinder will be preferable.
Should Megaflo be on all the time?
Personally I will leave it on permanently. It will stop when the temperature reached the set temperature at the cylinder thermostat. The hot water inside should stay hot for a long time, without the need for the boiler (or immersion heater) to fire up.
Should I replace my water tank with a combi boiler?
If you have recently purchased a new house, your current boiler has failed, or your boiler is more than 12 years old, you should consider replacing it with a combi boiler. Combi boilers are wonderful because they give both space heating and water on demand, eliminating the need for a hot water tank.
Is a combi boiler cheaper to run than a system boiler?
Potentially a combi boiler may be cheaper to run, but the real deciding factor is your water consumption. A combi boiler is more energy-efficient, but if you are using a lot of hot water consistently, it may not be as cost-effective.
Can you heat a hot water tank with a combi boiler?
Yes definitely can be done and many homes have combi boiler and a hot water cylinder. Gives the option of connecting the combi hot supply to close by taps and also gives advantage of mains pressure hot water to a shower for example. Just plumb and wire basically same as a system boiler otherwise.
What is better combi or system boiler?
For larger homes with multiple bathrooms, particularly with showers in use at the same time, a system boiler with a large hot water cylinder is nearly always a better option. Bigger combi boilers have been developed to provide lots of hot water, but they can make the heating system less efficient.
Are Megaflo systems good?
A Megaflo provides good water pressure, even if two showers are running at the same time. Megaflo's allow two or more hot water sources to be run at the same time, for example a tap in the kitchen can be run at the same time as a shower. They usually come with a warranty of around 25 years.
Is combi boiler good for large house?
The truth is that even the smallest combi boilers will heat most larger homes and the best solution for you might not be a combi at all. The real driver for selecting the right boiler for a larger home is your hot water requirements. If you need lots of hot water, a hot water cylinder will be preferable.
Do you need Megaflow for underfloor heating?
get a plumber /heating engineer to look at it for you,as to megaflow or combi boiler,you can use a combi, system, or vented boiler to supply your underfloor heating,megaflow for hot water,but combi or megaflow both systems need good mains pressure and volume to work well.
Megaflo with a combi boiler | DIYnot Forums
The reason I was think of splitting, is bcause originally was going to have a 250L cylinder (for a 4bed, 2 bathroom house). Now am having 210L and am aware that megaflo water runs out quicker than gravity fed cylinder because the flo rate is quicker hence giving a lovely powerful shower.
What is best, a megaflow system or a combi boiler? - MyBuilder
We have a 4 bedroom house built in 1989. Early next year we will want to update our heating system and free up a new corner in our bathroom where a cupboard currently houses an immersion tank - then a new bathroom and ensuite can be fitted.
Megaflow hot water problems faults help and advice
Hello. my name’s Mark, and welcome to our specialist Megaflo Unvented Cylinder website. This website has been upgraded for Tablet and Mobile phone compatibility.
What sinks will be well served by the combi?
Domestic sinks and handbasins will be well served by the combi.
How does a boiler work?
The boiler heats water that is pumped around your radiators and this heated water can just as well pass through an indirect heating loop in a cylinder as a radiator. You could arrange the motor valve in such a way that the cylinder gets priority over the central heating (just like a conventional system) - but the hot water supplied directly ...
Is a combi boiler the same as a central heating boiler?
If you look upon a combi boiler as a normal central heating boiler with an extra heating loop for domestic hot water it operates in exactly the same way as any other central heating boiler - except directly heated domestic hot water gets priority when you open a hot tap.
Can you fit an unvented H/W cylinder to a combi boiler?
You (or should I say a qualified person) can fit an unvented H/W cylinder to a combi boiler. It can be done in exactly the same way as a conventional system. ie using motor valves and thermostats. Because of potential danger of major explosion (hole is side of house - dead bodies etc) this must be done by a legally qualified person.
Mamps
I'm in the process of major house renovations. Its a 3 bed semi with 1 bathroom, but now I will have a loft ext with ensuite and an kitchen extension with utility room.
Mamps
Forgot to mention, another option is to keep my existing boiler. Its a Potterton suprima. Never given me any problems except for recently, it switches off for no reason and I have to press the reset button. Has been regularly doing that recently.
gas4you
It sounds as thought the pcb may need replacing. Depending on who fixes it could be up to £320.
Mamps
Thanks Dave. So the question now is system or combi boiler? and if i have a combi, do I split the kitchen/utility/cloackroom to use combi direct and the bathroom and ensuite shower to use the megaflo...
Mamps
Ok, so if I do have a combi and a megaflo, will the water in the cylinder be heated by the combi? so i'll still be having an indirect cylinder? I don't want to be using electic to heat the water in the cylinder as this would work out expensive in bills. Also, its the splitting of the water (only bathroom & ensuite water from cylinder) be a very big job for the plumber? The new megaflo and cylinder will be positioned in the utility room next to the new kitchen.
mysteryman
As you are using an unvented cylinder, you may as well use it for all hot water, and fit a system boiler.
Mamps
The reason I was think of splitting, is bcause originally was going to have a 250L cylinder (for a 4bed, 2 bathroom house). Now am having 210L and am aware that megaflo water runs out quicker than gravity fed cylinder because the flo rate is quicker hence giving a lovely powerful shower.
What are the pros and cons of a megaflo boiler?
The first pro of having a Megaflo system is that if you have a household that has limited space available, you are not going to need to make room for a big loft installed tank as well as the cylinder.
How does a Megaflo system work?
The first thing that you need to know is that there are two types of unvented Megaflo.
What is a megaflo tank?
A Megaflo hot water cylinder is to be used alongside a system boiler. A Megaflo tank would be needed if: If you often run up to 3 baths and a shower at once. If you have over a 16 litres per minute flow rate. High water pressure is demanded. If you have the spare storage space to fit the cylinder.
What is Megaflo hot water?
The Megaflo hot water system is the most popular range that the company has ever produced and has even won awards for being so great.
What temperature is dangerous for a boiler?
If the temperature of the water in your cylinder exceeds 100 degrees celsius, this can be extremely dangerous, which is why unvented boiler systems use thermostat controls to keep the temperature correct.
What is the difference between a water heater and a boiler?
The difference between the two is how the water is heated. If it is indirect, the water is heated by a separate regular bo iler or system boiler. If it is directly heated, then it is going to be heated by a built-in element that is already in the cylinder.
Can you view Megaflo installation manual?
If you have recently purchased a Megaflo boiler system, you can view the official Megaflo installation and manual guide here.
How does a Megaflo boiler work?
The main point of appeal for a Megaflo boiler is that they are connected directly to the cold water mains supply.
What Megaflo boilers are currently available?
There are currently four manufacturers making Megaflo boiler systems in the UK.
What is a Megaflo boiler?
As we mentioned above, the Megaflo name came about when Heatrae Sadia invented a new unvented hot water cylinder which is used in many of their electrically-powered central heating systems.
How much does it cost to install a Megaflo boiler?
As with any boiler replacement or installation project, costs can vary considerably depending on:
What is the warranty on Megaflo boilers?
As with all boiler systems, getting a generous warranty is essential for your peace of mind.
What temperature should a boiler be?
The temperature of the water inside the cylinder should be between 60c and 65c. This is controlled by an internal thermostat as exceeding 100 c would be extremely dangerous as the boiler could explode. If the boiler is unable to reach the 60c – 65c level, you risk harmful bacteria growing inside the cylinder.
What is the difference between a direct Megaflo and a regular boiler?
If the cylinder is indirect, it is heated by a separate regular boiler or system boiler whereas a direct Megaflo boiler has a built-in element to create the hot water for your home.
Which is better, Megaflow or combi?
Well thats a broad question but would say the Megaflow better due to the fact its Mains pressure hotwater with stored amount that allows you to have immersion back up if boiler breaksdown. Also with Megaflow you will have better pressure hotwater to feed say two/three bathrooms +, a simple combi would struggle to maintian that level of output. if a combi breaks down no back up and no heating also.
What are the downsides of Megaflow?
Downsides to megaflow VERY PRICEY 22mm feed to cylnder required and not as effecient as combi as heating stored amount.
What sinks will be well served by the combi?
Domestic sinks and handbasins will be well served by the combi.
How does a boiler work?
The boiler heats water that is pumped around your radiators and this heated water can just as well pass through an indirect heating loop in a cylinder as a radiator. You could arrange the motor valve in such a way that the cylinder gets priority over the central heating (just like a conventional system) - but the hot water supplied directly ...
Is a combi boiler the same as a central heating boiler?
If you look upon a combi boiler as a normal central heating boiler with an extra heating loop for domestic hot water it operates in exactly the same way as any other central heating boiler - except directly heated domestic hot water gets priority when you open a hot tap.
Can you fit an unvented H/W cylinder to a combi boiler?
You (or should I say a qualified person) can fit an unvented H/W cylinder to a combi boiler. It can be done in exactly the same way as a conventional system. ie using motor valves and thermostats. Because of potential danger of major explosion (hole is side of house - dead bodies etc) this must be done by a legally qualified person.
