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Left hand Supply shown — Right hand supply available

BL BLBL BL

Same End Series — 3 Radiators maximum

Opposite End Series — 7 Radiators (100 feet) maximum

Opposite End Series can be piped with Runtal

Radiators according to standard perimeter heating designs.

Radiator Expansion

Runtal Radiators will expand during normal operation to a maximum

of 0.16 inch per foot at 215º F. Proper expansion compensation

should be provided in the piping, especially in series piping.

Technical Data

for Hydronic Radiators

Technical Data

for Electric Radiators (Baseboard)

Pitching the Radiator: Steam Radiators must be tilted at least

1/16” per foot towards the condensate return.

Technical Data for Steam Radiators

Closed Loop System Required

Runtal Radiators are manufactured of cold rolled low carbon

steel and should be used only in a closed loop hydronic system.

Fully venting the panels and system of air is critical. This will allow

adequate water ﬂow throughout the panels for proper operation.

Radiator Pressure Ratings

• Standard Pressure Tube/Rating 56 psi Max-Tested at 74 psi

• Medium Pressure Tube/Rating 85 psi Max-Tested at 110 psi

• High Pressure Tube/Rating 128 psi Max-Tested at 184 psi.

Pressure Drop Considerations

Individually piped Runtal Radiators have minimal pressure drops,

usually less than 0.5 feet of head per radiator. Medium and high

pressure radiators have slightly higher pressure drops than the

equivalent standard pressure model. To calculate speciﬁc pressure drop

values for projects in design, contact your Runtal Sales Representative.

Flow Rate Considerations

Flow rates with Runtal may differ from ﬂow rates with ﬁn-tube

products by virtue of the Runtal ﬂat tube design. Turbulent ﬂow for

good heat transfer is achieved at comparably lower ﬂow rates with

ﬂat tubes than with round tubes. The resulting lower ﬂow rates

can provide higher delta T’s, lower average water temperatures,

and allow the use of smaller pumps for better system efﬁciency.

Piping Arrangements

Runtal offers several different piping conﬁgurations with the most

popular illustrated below. For other connection options, please

consult your Runtal Representative.

Series Piping Arrangements

A same end series with Runtal produces equivalent average water

temperatures in all the radiators, and in some cases can reduce

the system piping required.

120 15 Amp 1440 14/2 with Ground

120 20 Amp 1920 12/2 with Ground

120 30 Amp 2880 10/2 with Ground

208 15 Amp 2496 14/2 with Ground

208 20 Amp 3328 12/2 with Ground

208 30 Amp 4992 10/2 with Ground

240 15 Amp 2880 14/2 with Ground

240 20 Amp 3840 12/2 with Ground

240 30 Amp 5760 10/2 with Ground

voltage CirCUit MaxiMUM wire

a.C. Breaker Size wattage Size

Connect multiple radiators in parallel: Multiple radiators must

be connected in parallel and not in a series.

Connect to a switching device: Runtal electric baseboard must

be connected to a switching device or a relay thermostat switch.

Maximum wattage on a circuit: For installation of multiple

electric baseboard radiators, the following chart should be

used. The chart indicates supply voltage, circuit breaker rating,

minimum wire size, and maximum total wattage of electric

baseboard on the circuit.

Runtal Colors

Standard Colors

Runtal

White

Wine Red Cream

White

Grey

White

Grey Blue Almond

Glacier

Grey

Moss

Green

Grey

Brown

Runtal

Steel

Aluminum Satin

Nickel

Metallic Colors

As well as colors shown above, Runtal offers a selection of

100 Optional Colors.

Printed colors are not an exact representation, so please

contact Runtal for a “Color Selection Guide.”