Round Day Tank Furnaces

Choose Round Day Tanks when you have no time for downtime due to a leaky crucible. These workhorses can go for years before major maintenance may be required. These furnaces are very efficient glass melters thanks to small external surface area, generous insulation, heat recuperation, tight construction, unique heating chamber design and large glass surface area exposed to the heat.

Round Day Tank models are lined with press bonded AZS. We have used this material since 1999, and found it to hold up very well to thermal shock and corrosion. The first furnace liner we built from this material lasted for 13 years at Tulane University in New Orleans, LA. We expect 8-10+ year lifespans and have recorded 35% reduction in heat loss compared to our earlier rectangle models. Clients report higher glass quality as well, which can be attributed to a decrease in combustion volume and the absence of corners in the tank liner.

Our furnaces come standard with OnSite, providing you with a smooth interface for the temperature controller, programmable text and email alerts, and remote access through the internet. Error Codes are displayed and interpreted, with common issues listed.

Round day tanks can be rebuilt or refurbished as they near the end of life.  With a refurbishment high wear castings and metal are replaced, the liner is ground and patched, existing metal is cleaned and repainted, and the control and heating system can be tested, upgraded, or replaced.  When a furnace is rebuilt, nearly all refractory is replaced, as well as high wear metal. Existing metal is reused as much as possible, and the control system can be reused as well.

Our standard models are listed below, but we can also work with you to customize the furnace with several options that can be added.  Electric furnaces require moderate assembly and installation of heating elements, transformer, and control panel at the furnaces location. Combustion Furnaces are nearly “plug and play”.

Options and Add-on's

Flue Damper (Combustion Only)

An automated flue damper closes down the flue at low fire, and opens at high fire. This helps keep heat in the furnace for more efficiency, but won’t cause back pressure issues when you need to get up to charging temp.

Remote Control (Combustion Only)

Tight on space around the furnace? This option replaces the control panel with a junction box, allowing the control panel to be mounted away from the furnace.  Ideal for equipment inside a full ventilation hood/plenum. Gas adjustments and the blower stay at the furnace.

Control and Power Center (Electric Only)

The majority of the wiring of the control panel to transformer, and transformer to furnace is completed at our shop.  The control panel is mounted on a stand above the transformer, and the transformer must be placed directly adjacent to the furnace.  This simplifies installation to be performed by your qualified electrician, but if you are constrained for space, full installation by your electrician is still the best choice.

Prices and Specs

Prices below are for complete assemblies that are TUV certified and tested. This includes the furnace body, control and heating system(s), thermocouple(s), and OnSite remote connectivity.  These prices are a best estimate and may change.  Please contact us to request a current quote with desired options and customization.

Spec sheets can be viewed at the link below. Some spec sheets are outdated, but weights and dimensions have stayed consistent over the years.  Contact us for updated versions when needed.

Spec Sheets

Combustion Round Day Tank
Product NameHeat Output (BTU/hr)Price (USD)
RDT400250000$45,077
RDT560400000$47,276
RDT740500000$49,391
RDT1000750000$56,265
Electric Round Day Tank
Product NameHeat Output (kW )Price (USD)
ERDT40025N/A
ERDT56030N/A
ERDT74040N/A
ERDT100050N/A