Products: Vacuum Type Water Heater

TOP > Products > Vacuum Type Water Heater

Case Studies

TOP > Products > Vacuum Type Water Heater

Hotel

Kariya Plaza Hotel

Installation of ultra-high efficiency vacuum type water heater (latent heat recovery type)

Kariya Plaza Hotel

They are in an excellent location, just a two-minute walk from the Meitetsu/JR Kariya Station. They are a long-established hotel popular with business travelers, individual travelers and groups, with a growing number of repeat guests attracted by their warm hospitality.

Hotel images

Reason for Selection

Approx. 20% energy savings and quick maintenance response

The previous water heater, manufactured by NTEC’s competitor, was installed when our hotel was newly built and was gradually failing more and more due to age-related deterioration. When we consulted with some boiler manufacturers, NTEC replied, “We will respond immediately if anything happens to the water heater!” Their words were very reassuring to us because a stable operation of the water heater is very important for us to make sure that our customers can relax in their baths. We were also concerned about the deterioration of the oil tank, as we used to use a fuel oil-fired water heater. They proposed that we can take advantage of subsidies by converting to gas fuel at the same time as the replacement, and we decided to install an ultra-high efficiency vacuum type water heater (latent heat recovery type). We are satisfied with both the 20% reduction in fuel costs in the first nine months of installation and the peace of mind that comes from the stable operation of the water heater.

President

NTEC’s Proposal

Vacuum type water heater
(latent heat recovery type)
Super Vacotin Heater

Super Vacotin Heater

High energy savings with ultra-high efficiency exceeding 100%

They were concerned about the breakdown of aging equipment and how to reduce fuel costs. We proposed the GTLH-500, an ultra-high efficiency vacuum type water heater (latent heat recovery type), and the use of subsidies by converting fuel to gas. The GTLH-500 has an extremely high efficiency of 103% and can also control combustion rate according to the hot water load, achieving outstanding energy-saving effects. In addition, the fuel has been converted to gas, eliminating the need for an oil tank and solving the problem of tank deterioration. We continue to provide a prompt maintenance response for their peace of mind.

Super Vacotin Heater GTLH
Super Vacotin Heater GTLH
Before and after of system efficiency

Effects

The introduction of vacuum type water heater (latent heat recovery type) has significantly
reduced fuel costs and carbon dioxide emissions, resulting in a lower environmental impact.

Fuel costs down by approx. 20% by improving efficiency of water heater
CO2 emissions down by approx. 34% by changing fuel from fuel oil to LPG and improving efficiency of water heater

Related Products

GTLH-500

Vacuum type water heater (latent heat recovery type)
Super Vacotin Heater GTLH

GTLH-500

● Specification
Output : 581kW
Efficiency : 105% (103% for propane)

View More

Case Studies

TOP > Products > Vacuum Type Water Heater

Hospital

Ookuramaya Memorial Hospital

Optimization of the thermal system

Ookuramaya Memorial Hospital

They are well known in the local community as a community-based hospital since 1963. In 2010, they joined the Yokohama Medical Group and are actively developing follow-up services for patients through cooperation among hospitals.

Hospital image

Reason for Selection

Understand where heat is going and use it effectively

We used to use NTEC’s competitor steam boilers for hot water supply, heating and cooling, and autoclaves. However, with the introduction of individual air conditioning and the electrification of the autoclaves, steam was used only for hot water supply. NTEC proposed a change to a hot water system that did not use steam, and after considering the possibility of cutting our gas costs by about half, we decided to go with the hot water system. The reduction in fuel costs was not only just as estimated, but it also gave us more space to expand our rehabilitation room, which in turn allowed us to provide more comprehensive rehabilitation services to our patients.

Head of Administration

NTEC’s Proposal

System conversion from
steam to hot water
Zero Steam®

Zero Steam®

Energy and cost savings by converting steam system to hot water system

The conventional steam system was used only for hot water supply, and there was a waste in discarding excess heat from the steam. Therefore, we proposed them a hot water system that directly supplies hot water. The system can save energy and cost without changing the use of the hot water. The EOL-100 is compact, highly efficient, and easy to operate.

Zero Steam®
Zero Steam®
Electric autoclave
Electric autoclave
Before and after of the system

Effects

When heat (steam) is used only for hot water supply, it is optimal to convert the steam system to a hot water system. By converting to a hot water system, they have eliminated heat loss due to sensible heat from steam condensate and blowdown and cut their fuel costs nearly in half. They have also eliminated the need for boiler chemicals and Class-1 pressure vessel inspections required with the steam system, which also saves them money.

Gas consumption down by approx. 50%
Boiler maintenance costs is 0 yen

Related Products

EOL-100

Vacuum type water heater
Vacotin Heater

EOL-100

● Specification
Output： 116kW
Efficiency : 90%

View More

Healthcare introductions and case studies

View More

Products / Vacuum Type Water Heater

TOP > Products > Vacuum Type Water Heater

Super Vacotin Heater
GTL/GTLH Series

Model Output Fuel
GTL-300 349 kW Natural gas
Propane
GTL-400 465 kW
GTL-500 / GTLH-500 581 kW
GTL-630 733 kW
GTL-800 930 kW
Super Vacotin Heater GTL/GTLH Series

Ultra-high efficiency

The alternate fin water tube arrangement (Patent No. 5788167) improves the heat transfer rate, resulting in a high efficiency of 95%. 5:1 turndown ratio (proportional combustion control) achieves a part-load efficiency of 96% or higher (at 20% load).

Comparison of the partial load efficiencies
Comparison of the partial load efficiencies

NOx emissions of 60 ppm or less (converted to 0% O2)

This model is equipped with an excellent low NOx split-flame burner with self-recirculating combustion. It is a highly environmentally friendly water heater with reduced emissions of NOx gas, a cause of acid rain and photochemical smog.

Divided flame burner
Divided flame burner

105%* efficiency through latent heat recovery

It is the world‘s first vacuum type water heater to achieve 105%* efficiency by recovering latent heat from the exhaust gas. The latent heat recovery unit can be retrofitted or bypassed.
* 103% for propane fired

Space-saving design

The GTLH can be carried in by dividing the main unit and the latent heat recovery unit, allowing it to be installed in a location with narrow carry-in routes.

What is a vacuum type water heater “Vacotin Heater”?

It consists mainly of a burner, combustion furnace, water tubes, heat transfer water, depressurized steam chamber and heat exchangers. There is no air inside the boiler body and it is completely sealed from the outside air. The heat transfer water is sealed over the furnace and water tubes, and the depressurized steam chamber is maintained at a reduced pressure below atmospheric so that when the heat transfer water is heated by the burner, it immediately boils, generating steam at the same temperature as the heat transfer water. The steam generated inside the boiler heats the heat transfer water by condensing on the surface of the heat exchangers located in the reduced pressure steam chamber and returns to the heat transfer water as water droplets. In other words, there is a heat transfer water cycle of “boiling, evaporation, condensation, and liquefaction” inside the boiler. Therefore, you don’t have to refill the heat transfer water and there is no risk of heating without water inside the boiler.

Structural drawing of Vacotin Heater