Combi boiler vs tank

Question

If I swap my old tank setup for a combi, will I lose any hot water when everyone’s in? I hate the idea of showers going cold, but I don’t know if a combi without a tank will struggle when everyone is getting ready in the morning

Vincent · Answer

If you get a big enough combi ie more kW it will cope with more taps being opened at same time.but combi gives constant hot water so will never run out like a tank would

Luke · Answer

The only reason you would struggle is if the heating engineer has not done his calculations correctly and fitted the incorrect kw boiler for your hot water demand, I personally do like a unvented cylinder as if your have a combi an its has a breakdown and you don’t have a electric shower you are without heating but if your boiler has a breakdown and you have a cylinder you can turn on the immersion heater and have hot water.

Lee · Answer

Yes. Combi will let you down on hot water if you use 2 showers at once. Other solutions is have one electric. Invented cylinder sized up correctly will be best solution

Chris · Answer

Pressurised cylinder is a better setup. Although if you have a good water pressure and flow rate a big enough combination boiler would suffice.

David · Answer

A combi will constantly give you hot water

If you have a couple of showers on the go at the same time it can sometimes cause issues

But if it’s just one shower at a time you could stand under it all day 👌

Susmil · Answer

In general combi is not Good for simultaneously showering. There are bigger combis so if you have a Good mains supply and a big combi you can take two showers at the same time.  ATAG is the highest water flow rate I belive navien worcester and Vaillant all do big combi boilers I would personally have a system boiler as you would have a immersion. Heater as back up. A combi in theory will never run out of water.

George · Answer

Depending on amount of bathrooms and demand of how many people require a shower at the same time, if you don’t shower at same time shouldn’t be a problem

Scott · Answer

If you go down combi route 

Valiant storage combi

Alamgir · Answer

Combi is much better than heat only boilers. If are using two shower at the same time then go for mega flow which is very expensive.

Combi boiler vs tank

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