🔥Cyber Monday: Get £200 off🔥
🔥Cyber Monday: Get £200 off🔥
🔥Cyber Monday: Get £200 off🔥
🔥Cyber Monday: Get £200 off🔥
🔥Cyber Monday: Get £200 off🔥
🔥Cyber Monday: Get £200 off🔥

Navien NCB700 Combi

Available in 42, 51 kW

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Manufacturers 12 year warranty

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Hydrogen blend ready

Fixed price install from


inc VAT

Latest gas condensing boiler technology

At Padly, we're thrilled to offer the NCB700 ON gas condensing combi boiler from Navien UK. This innovative boiler caters to larger properties, delivering hot water to three bathrooms at once. The NCB700 ON maximizes domestic hot water recirculation, reduces water wastage, and offers impressive flow rates. It's user-friendly with a built-in pump for fast hot water delivery and NaviCirc for easy hot water return system setup. The boiler boasts a powerful 54kW hot water output, an industry-leading turndown ratio, and an ErP A+ energy efficiency rating. It's durable with stainless steel heat exchangers and future-proof, being hydrogen-ready. Plus, it comes with a 12-year warranty for peace of mind. Choose Padly for your boiler needs and experience the NCB700 ON difference.

Experience the Game-Changing Benefits of the Navien NCB700

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Built-in DHW pump for quick hot water to taps

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Built-in clear digital display for energy usage

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Guaranteed long-term efficiency and durability

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Ultra-low running costs with Smart Plus controls

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Comes in 54kW for flow rates of up to 22lpm

What's the specifics?

W 440 x D 335 x H 695
Warranty Length
Manufacturers 12 year warranty
Boiler Type
Efficiency Rate
Rated A (94%) for energy efficiency
Fuel Type
It's more than an install with Padly

What's included?

Boiler and pipework installation

Whether you’re getting a new improved system boiler or upgrading to a combi boiler, we appreciate that sometimes it’s necessary to have pipework alterations when a new boiler is installed. That’s why any pipework is included in the price of your installation.

Removal and disposal of your old boiler

At Padly we pride ourselves on ensuring our boiler installations are as easy and stress free as possible therefore, our engineers will ensure the removal and disposal of your old boiler is taken care of.

Removal of old tanks and pipework

If you’re looking to change from a system or heat-only boiler to a combination there will be no need for you to have a water tank in your attic freeing up space. Our installers remove old water tanks and boilers upon installation of your new system.

Chemical flush your system

After installing a brand-new boiler, we will complete a chemical flush, free of charge. Our engineers will complete a power flush designed to remove the sludgy build-up and grime that can accumulate in your central heating system over the years so you new boiler can work side by side with a clean central heating system.


Your new boiler installation will go hand in hand with a new thermostat. We will give you the choice of a standard replacement or upgrading to a smart thermostat to become compatible with smart home technology such as nest.


All our boilers come with a manufacturers warranty; however, the length of these warranties is dependent on the boiler you choose. For example, our Worcester Bosch Greenstar range comes with a warranty of up to 10 years.