The New Navien NCB700 ON - Game-Changing?

In this video we take an in depth look at the brand new Navien NCB700 ON combi boiler. Navien has made some bold claims on their website about the unique features of this boiler and its only right that we put it to the test! This is a real life boiler install paired with new central heating. Can this combi boiler really run 3 showers simultaneously? Can it provide 22 liters of hot water per minute? Are unvented cylinders obsolete? How does the hot water re-circulation work with a combi boiler? All these questions answered and more when we install and commission this new beast! For more information on this product please click the link below

[effervescence]

First UK install I've seen of this system, I saw them when living state side but normally water heaters not combi's. Looks like a good product for a niche situation where a conversion no longer has room for tanks etc.

[sunnybeachwalksk]

Really enjoyed the video, love to see more pro press work, your channel is probably Best plumbing channel on YouTube, I was a plumber gas engineer for about 20 years back in London now retired to Spain

[plumbertime]

Nice. Problem is people will just fit that boiler as a replacement that can run 3 showers and it won’t as it’ll be on 15mm hot and colds then it’ll get a bad name.
Wouldn’t it work out more efficient to just have an unvented. Never quite get 50kw combos. Should have space for a cylinder if you’ve a house that needs 50kw

[ramman]

a neighbour had one of these installed a couple of years ago in the us, over hear they are known as the ncb-h they are a bit different compared to your typical uk models, and need to descale the condenser every year, so you must fit the supplied a couple of T on flow and return for easy pipe connection but they are a bit awkward to fit to so you may want to add your own drain off them, down sides, circuit boards have had a issue in some, his was affected as well, but since the swap its been trouble free, its only 22litres at 50c rise, but its a monster of a boiler, the 15 to1 ratio still means its modulated down to 3.5kw, to be fair its the closest thing your going to see a burner style like this is like the old combi pre condensing years, it weighs the same too, I believe the model shown is the 54kw model 22000 btu. they do a 45kw model also, if you run on LPG -(blue flame to us) it has its own model definition, it burns a little more gas as well typical of lpg by about 2kw

[Skeletoncrewand]

Going to fit ncb 500 or 300 only need 2 shower + tap.

Fitting in 600 x 900 x 300 wall cabinet.

Do you know how far the service valves stick out the bottom. Need to fit into a 900mm high wall cabinet and dont want vavles sticking out the bottom. Have 150mm above cabinet for flew ect....i know i need to leave 250mm but can leave room in the ceiling above for this. Cant find total from top of flue to bottom of valves in the mi's?

Any help would be appriciated, the rep still hasnt called me back, will try him again monday.

Have total hight of 1050mm to fit it in neatly into wall cabinet.

[МихаилЧеркесов-ед]

Жаль, что нет русского перевода! Работа отличная, Вы молодцы! Удачи Вам!

[kornelk.]

Nice install, hoewer I am not fan of Navien, seen them when lived and worked in US, also seen recently a lot of Navien in US has had leak issue, poor plastic parts etc.. I hope UK market will be better.. Will see..

[jockster]

Looks really good. Thanks for your efforts 👍

[FrustratedBaboon]

Why did you put all of the water piping above the Navien? Won't you burn out electronics or rust the non-SS metal components if there is a slow leak or break?

[brendanfisher]

Have you watched mikey pipes on YouTube. American plumber who shows the problems with navien. E.g. main heat exchanger leaks POC straight out of the box.

[cynt]

How many Navien boilers have you installed? i’ve used Ideal for the past 10 years but they are now pricing themselves out of the market. I’m about to fit my first navien on a new build. what are their call out times if there is a fault. lovely neat job by the way.

[Fireswiper]

What’s the turn down ratio of this boiler? What is the minimum kWh output? I would fear a boiler this large would be massively oversized even for a home of this size for heating.

[five-eyes]

How does thus compare to a Baxi? Looking to change out a tired Baxi?

[TraderStig]

any idea what that is called in the USA? On US site, there is nothing with a 700 in the name.

[heatpump]

Not a fan of navien, poor back up. They just seem to be paying all the YouTubers to say their great

[jassinghIG]

Have you installed the Viessmann 111-W yet? How do they compare. ?

[SKumar-ggtx]

We have around 17 lpm from the outside cold tap. Would that do 2 showers from this boiler?

[geotj]

Why buy a condensing combi with all the benefits of cost cutting, to fit a secondary loop system which is proven waste of money, people often complain saing am wasting gallons of water before I get hw ? 1. you are not wasting water, there is still the same amount of water on this planet as there was on the day of creation(fact, check it out) 2. water being on a meter or rates costs less than 1/1000 times less than wasting gas; ie run your tap for 30 seconds of cold water to get hot water at 10ltrs/min costs you 0.001p if you use a pre heated gas boiler you get hot water after 10 seconds using 0.01p of water but you have pre burnt 10p of gas, water will never run out but gas will

[laitang]

Looks like a nightmare to open up and clean the heat exchanger.

[dennisduffy]

And they last about 5 years 😱 quit using that junk 😮