Greece faces early election after PM loses vote on president

* Samaras announces snap poll for Jan. 25

* Opposition leader says austerity belongs to past

* Parliament rejects Samaras candidate for president

* Stocks fall 11 pct, bond yields jump over 9 pct (Adds colour, market reaction)

By Renee Maltezou and Lefteris Papadimas

ATHENS, Dec 29 (Reuters) - Greece heads to an early general election next month after parliament rejected Prime Minister Antonis Samaras's nominee for president on Monday, throwing the country into a new period of political turmoil just as it emerges from economic crisis.

Greek 10-year bond yields surged to a 15-month high and stocks tumbled after former European Commissioner Stavros Dimas fell short of the 180 votes needed to become president in the decisive third round of voting, triggering the dissolution of parliament.

Samaras set Jan. 25 as the date for a parliamentary election.

Opinion polls point to a victory by the radical leftist Syriza party, which wants to wipe out a big part of the national debt, and cancel the austerity terms of a 240-billion euro ($290 billion) bailout from the European Union and International Monetary Fund that Greece still needs to pay its bills.

While most Greeks do not appear to want elections, the terms of the bailout agreed by the Samaras government have imposed harsh sacrifices on many people and the signs of improvement in their battered economy have yet to show through clearly.

If Syriza is elected, it would be the first time an anti-bailout party determined to overturn the austerity approach prescribed since the start of the euro zone crisis comes to power in Europe.

"With the will of our people, in a few days bailouts tied to austerity will be a thing of the past," Syriza leader Alexis Tsipras said after the vote. "The future has already begun."

A defeated Samaras, who gambled and lost by bringing forward the presidential vote by two months, urged Greeks to vote for stability and vowed not to let anyone put Greece's place in Europe in question.

The result opens a new chapter of political uncertainty in the euro zone's problem child just as it appeared to be putting the worst of a six-year economic crisis behind it. After nearly crashing out of the euro in 2012, Greece this year returned to economic growth and ended a four-year exile from bond markets.

Syriza has held a steady lead in opinion polls for months, although its advantage over Samaras' conservative New Democracy party has narrowed in recent weeks. Weakness among potential coalition partners on both sides could mean that whichever party wins in January will struggle to form a government.